diff --git src/_index.php src/_index.php
index 86334797d6..cc2a532abe 100644
--- src/_index.php
+++ src/_index.php
@@ -14,4 +14,4 @@
 define( 'WP_USE_THEMES', true );
 
 /** Loads the WordPress Environment and Template */
-require( dirname( __FILE__ ) . '/wp-blog-header.php' );
+require __DIR__ . '/wp-blog-header.php';
diff --git src/index.php src/index.php
index 9e8f9ec856..f6613cb54f 100644
--- src/index.php
+++ src/index.php
@@ -8,7 +8,7 @@
 
 /** Define ABSPATH as this file's directory */
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( __FILE__ ) . '/' );
+	define( 'ABSPATH', __DIR__ . '/' );
 }
 
 if ( file_exists( ABSPATH . 'wp-includes/js/dist/edit-post.js' ) ) {
@@ -17,14 +17,14 @@ if ( file_exists( ABSPATH . 'wp-includes/js/dist/edit-post.js' ) ) {
 }
 
 define( 'WPINC', 'wp-includes' );
-require_once( ABSPATH . WPINC . '/load.php' );
+require_once ABSPATH . WPINC . '/load.php';
 
 // Standardize $_SERVER variables across setups.
 wp_fix_server_vars();
 
-require_once( ABSPATH . WPINC . '/functions.php' );
+require_once ABSPATH . WPINC . '/functions.php';
 define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
-require_once( ABSPATH . WPINC . '/version.php' );
+require_once ABSPATH . WPINC . '/version.php';
 
 wp_check_php_mysql_versions();
 wp_load_translations_early();
diff --git src/js/_enqueues/vendor/tinymce/wp-tinymce.php src/js/_enqueues/vendor/tinymce/wp-tinymce.php
index 3d7b2347f6..fa89ca9272 100644
--- src/js/_enqueues/vendor/tinymce/wp-tinymce.php
+++ src/js/_enqueues/vendor/tinymce/wp-tinymce.php
@@ -11,7 +11,7 @@
  */
 error_reporting( 0 );
 
-$basepath = dirname( __FILE__ );
+$basepath = __DIR__;
 
 function get_file( $path ) {
 
diff --git src/wp-activate.php src/wp-activate.php
index 0349f3fa37..efd59fe1a9 100644
--- src/wp-activate.php
+++ src/wp-activate.php
@@ -9,9 +9,9 @@
 define( 'WP_INSTALLING', true );
 
 /** Sets up the WordPress Environment. */
-require( dirname( __FILE__ ) . '/wp-load.php' );
+require __DIR__ . '/wp-load.php';
 
-require( dirname( __FILE__ ) . '/wp-blog-header.php' );
+require __DIR__ . '/wp-blog-header.php';
 
 if ( ! is_multisite() ) {
 	wp_redirect( wp_registration_url() );
diff --git src/wp-admin/_index.php src/wp-admin/_index.php
index 9389409e88..22d9100d0c 100644
--- src/wp-admin/_index.php
+++ src/wp-admin/_index.php
@@ -7,10 +7,10 @@
  */
 
 /** Load WordPress Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** Load WordPress dashboard API */
-require_once( ABSPATH . 'wp-admin/includes/dashboard.php' );
+require_once ABSPATH . 'wp-admin/includes/dashboard.php';
 
 wp_dashboard_setup();
 
@@ -108,7 +108,7 @@ $screen->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -153,4 +153,4 @@ if ( has_action( 'welcome_panel' ) && current_user_can( 'edit_theme_options' ) )
 <?php
 wp_print_community_events_templates();
 
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/about.php src/wp-admin/about.php
index 3a7865a9fe..d496bff9b7 100644
--- src/wp-admin/about.php
+++ src/wp-admin/about.php
@@ -7,14 +7,14 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /* translators: Page title of the About WordPress page in the admin. */
 $title = _x( 'About', 'page title' );
 
 list( $display_version ) = explode( '-', get_bloginfo( 'version' ) );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 	<div class="wrap about__container">
 
@@ -202,7 +202,7 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 	</div>
 <?php
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
 
 // These are strings we may use to describe maintenance/security releases, where we aim for no new strings.
 return;
diff --git src/wp-admin/admin-ajax.php src/wp-admin/admin-ajax.php
index deea44152c..cc5a8db499 100644
--- src/wp-admin/admin-ajax.php
+++ src/wp-admin/admin-ajax.php
@@ -19,7 +19,7 @@ if ( ! defined( 'WP_ADMIN' ) ) {
 }
 
 /** Load WordPress Bootstrap */
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 /** Allow for cross-domain requests (from the front end). */
 send_origin_headers();
@@ -33,10 +33,10 @@ if ( empty( $_REQUEST['action'] ) ) {
 }
 
 /** Load WordPress Administration APIs */
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
 
 /** Load Ajax Handlers for WordPress Core */
-require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
+require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';
 
 send_nosniff_header();
 nocache_headers();
diff --git src/wp-admin/admin-functions.php src/wp-admin/admin-functions.php
index 1185268744..a9ff3f44b9 100644
--- src/wp-admin/admin-functions.php
+++ src/wp-admin/admin-functions.php
@@ -12,4 +12,4 @@
 _deprecated_file( basename( __FILE__ ), '2.5.0', 'wp-admin/includes/admin.php' );
 
 /** WordPress Administration API: Includes all Administration functions. */
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
diff --git src/wp-admin/admin-header.php src/wp-admin/admin-header.php
index 631bc67ef3..43652039f1 100644
--- src/wp-admin/admin-header.php
+++ src/wp-admin/admin-header.php
@@ -8,7 +8,7 @@
 
 header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
 if ( ! defined( 'WP_ADMIN' ) ) {
-	require_once( dirname( __FILE__ ) . '/admin.php' );
+	require_once __DIR__ . '/admin.php';
 }
 
 /**
@@ -233,7 +233,7 @@ if ( current_user_can( 'customize' ) ) {
 ?>
 
 <div id="wpwrap">
-<?php require( ABSPATH . 'wp-admin/menu-header.php' ); ?>
+<?php require ABSPATH . 'wp-admin/menu-header.php'; ?>
 <div id="wpcontent">
 
 <?php
@@ -289,5 +289,5 @@ if ( is_network_admin() ) {
 do_action( 'all_admin_notices' );
 
 if ( $parent_file == 'options-general.php' ) {
-	require( ABSPATH . 'wp-admin/options-head.php' );
+	require ABSPATH . 'wp-admin/options-head.php';
 }
diff --git src/wp-admin/admin-post.php src/wp-admin/admin-post.php
index 48e76feec5..803a00652c 100644
--- src/wp-admin/admin-post.php
+++ src/wp-admin/admin-post.php
@@ -14,15 +14,15 @@ if ( ! defined( 'WP_ADMIN' ) ) {
 }
 
 if ( defined( 'ABSPATH' ) ) {
-	require_once( ABSPATH . 'wp-load.php' );
+	require_once ABSPATH . 'wp-load.php';
 } else {
-	require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+	require_once dirname( __DIR__ ) . '/wp-load.php';
 }
 
 /** Allow for cross-domain requests (from the front end). */
 send_origin_headers();
 
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
 
 nocache_headers();
 
diff --git src/wp-admin/admin.php src/wp-admin/admin.php
index 5f8916ed41..029147c867 100644
--- src/wp-admin/admin.php
+++ src/wp-admin/admin.php
@@ -31,7 +31,7 @@ if ( isset( $_GET['import'] ) && ! defined( 'WP_LOAD_IMPORTERS' ) ) {
 	define( 'WP_LOAD_IMPORTERS', true );
 }
 
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 nocache_headers();
 
@@ -73,7 +73,7 @@ if ( get_option( 'db_upgraded' ) ) {
 		 * attempt to do no more than threshold value, with some +/- allowed.
 		 */
 		if ( $c <= 50 || ( $c > 50 && mt_rand( 0, (int) ( $c / 50 ) ) == 1 ) ) {
-			require_once( ABSPATH . WPINC . '/http.php' );
+			require_once ABSPATH . WPINC . '/http.php';
 			$response = wp_remote_get(
 				admin_url( 'upgrade.php?step=1' ),
 				array(
@@ -89,7 +89,7 @@ if ( get_option( 'db_upgraded' ) ) {
 	}
 }
 
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
 
 auth_redirect();
 
@@ -146,11 +146,11 @@ if ( isset( $_REQUEST['taxonomy'] ) && taxonomy_exists( $_REQUEST['taxonomy'] )
 }
 
 if ( WP_NETWORK_ADMIN ) {
-	require( ABSPATH . 'wp-admin/network/menu.php' );
+	require ABSPATH . 'wp-admin/network/menu.php';
 } elseif ( WP_USER_ADMIN ) {
-	require( ABSPATH . 'wp-admin/user/menu.php' );
+	require ABSPATH . 'wp-admin/user/menu.php';
 } else {
-	require( ABSPATH . 'wp-admin/menu.php' );
+	require ABSPATH . 'wp-admin/menu.php';
 }
 
 if ( current_user_can( 'manage_options' ) ) {
@@ -231,7 +231,7 @@ if ( isset( $plugin_page ) ) {
 		 */
 		do_action( "load-{$page_hook}" ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 		if ( ! isset( $_GET['noheader'] ) ) {
-			require_once( ABSPATH . 'wp-admin/admin-header.php' );
+			require_once ABSPATH . 'wp-admin/admin-header.php';
 		}
 
 		/**
@@ -277,17 +277,17 @@ if ( isset( $plugin_page ) ) {
 		do_action( "load-{$plugin_page}" ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 
 		if ( ! isset( $_GET['noheader'] ) ) {
-			require_once( ABSPATH . 'wp-admin/admin-header.php' );
+			require_once ABSPATH . 'wp-admin/admin-header.php';
 		}
 
 		if ( file_exists( WPMU_PLUGIN_DIR . "/$plugin_page" ) ) {
-			include( WPMU_PLUGIN_DIR . "/$plugin_page" );
+			include WPMU_PLUGIN_DIR . "/$plugin_page";
 		} else {
-			include( WP_PLUGIN_DIR . "/$plugin_page" );
+			include WP_PLUGIN_DIR . "/$plugin_page";
 		}
 	}
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 	exit();
 } elseif ( isset( $_GET['import'] ) ) {
@@ -322,10 +322,10 @@ if ( isset( $plugin_page ) ) {
 	$title        = __( 'Import' );
 
 	if ( ! isset( $_GET['noheader'] ) ) {
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 	}
 
-	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+	require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 	define( 'WP_IMPORTING', true );
 
@@ -345,7 +345,7 @@ if ( isset( $plugin_page ) ) {
 
 	call_user_func( $wp_importers[ $importer ][2] );
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 	// Make sure rules are flushed
 	flush_rewrite_rules( false );
diff --git src/wp-admin/async-upload.php src/wp-admin/async-upload.php
index 4d37f7f644..4017e3bbe9 100644
--- src/wp-admin/async-upload.php
+++ src/wp-admin/async-upload.php
@@ -15,17 +15,17 @@ if ( ! defined( 'WP_ADMIN' ) ) {
 }
 
 if ( defined( 'ABSPATH' ) ) {
-	require_once( ABSPATH . 'wp-load.php' );
+	require_once ABSPATH . 'wp-load.php';
 } else {
-	require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+	require_once dirname( __DIR__ ) . '/wp-load.php';
 }
 
-require_once( ABSPATH . 'wp-admin/admin.php' );
+require_once ABSPATH . 'wp-admin/admin.php';
 
 header( 'Content-Type: text/plain; charset=' . get_option( 'blog_charset' ) );
 
 if ( isset( $_REQUEST['action'] ) && 'upload-attachment' === $_REQUEST['action'] ) {
-	include( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
+	include ABSPATH . 'wp-admin/includes/ajax-actions.php';
 
 	send_nosniff_header();
 	nocache_headers();
diff --git src/wp-admin/comment.php src/wp-admin/comment.php
index 145cd7a5ea..a597361d1d 100644
--- src/wp-admin/comment.php
+++ src/wp-admin/comment.php
@@ -7,7 +7,7 @@
  */
 
 /** Load WordPress Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $parent_file  = 'edit-comments.php';
 $submenu_file = 'edit-comments.php';
@@ -58,7 +58,7 @@ switch ( $action ) {
 		);
 
 		wp_enqueue_script( 'comment' );
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		$comment_id = absint( $_GET['c'] );
 
@@ -77,7 +77,7 @@ switch ( $action ) {
 
 		$comment = get_comment_to_edit( $comment_id );
 
-		include( ABSPATH . 'wp-admin/edit-form-comment.php' );
+		include ABSPATH . 'wp-admin/edit-form-comment.php';
 
 		break;
 
@@ -106,7 +106,7 @@ switch ( $action ) {
 			die();
 		}
 
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		$formaction    = $action . 'comment';
 		$nonce_action  = 'approve' == $action ? 'approve-comment_' : 'delete-comment_';
@@ -357,4 +357,4 @@ switch ( $action ) {
 
 } // end switch
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/credits.php src/wp-admin/credits.php
index af4792d2b4..d9b4ad2df7 100644
--- src/wp-admin/credits.php
+++ src/wp-admin/credits.php
@@ -7,14 +7,14 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
-require_once( dirname( __FILE__ ) . '/includes/credits.php' );
+require_once __DIR__ . '/admin.php';
+require_once __DIR__ . '/includes/credits.php';
 
 $title = __( 'Credits' );
 
 list( $display_version ) = explode( '-', get_bloginfo( 'version' ) );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 
 $credits = wp_credits();
 ?>
@@ -82,7 +82,7 @@ $credits = wp_credits();
 <?php
 if ( ! $credits ) {
 	echo '</div>';
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 	exit;
 }
 ?>
@@ -129,7 +129,7 @@ if ( ! $credits ) {
 </div>
 <?php
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
 
 return;
 
diff --git src/wp-admin/custom-background.php src/wp-admin/custom-background.php
index e6ff310e72..37b8c3d8b8 100644
--- src/wp-admin/custom-background.php
+++ src/wp-admin/custom-background.php
@@ -12,4 +12,4 @@
 _deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-admin/includes/class-custom-background.php' );
 
 /** Custom_Background class */
-require_once( ABSPATH . 'wp-admin/includes/class-custom-background.php' );
+require_once ABSPATH . 'wp-admin/includes/class-custom-background.php';
diff --git src/wp-admin/custom-header.php src/wp-admin/custom-header.php
index d99f192da8..d89f03bbaa 100644
--- src/wp-admin/custom-header.php
+++ src/wp-admin/custom-header.php
@@ -12,4 +12,4 @@
 _deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-admin/includes/class-custom-image-header.php' );
 
 /** Custom_Image_Header class */
-require_once( ABSPATH . 'wp-admin/includes/class-custom-image-header.php' );
+require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
diff --git src/wp-admin/customize.php src/wp-admin/customize.php
index d0f39a5ba5..4954ca99ba 100644
--- src/wp-admin/customize.php
+++ src/wp-admin/customize.php
@@ -10,7 +10,7 @@
 define( 'IFRAME_REQUEST', true );
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'customize' ) ) {
 	wp_die(
diff --git src/wp-admin/edit-comments.php src/wp-admin/edit-comments.php
index b159c0a179..3178dd7b67 100644
--- src/wp-admin/edit-comments.php
+++ src/wp-admin/edit-comments.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 if ( ! current_user_can( 'edit_posts' ) ) {
 	wp_die(
 		'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
@@ -205,7 +205,7 @@ get_current_screen()->set_screen_reader_content(
 	)
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -351,4 +351,4 @@ if ( isset( $_REQUEST['approved'] ) || isset( $_REQUEST['deleted'] ) || isset( $
 <?php
 wp_comment_reply( '-1', true, 'detail' );
 wp_comment_trashnotice();
-include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/edit-form-advanced.php src/wp-admin/edit-form-advanced.php
index e7127fbcb2..e1dcbd3484 100644
--- src/wp-admin/edit-form-advanced.php
+++ src/wp-admin/edit-form-advanced.php
@@ -264,7 +264,7 @@ if ( $autosave && mysql2date( 'U', $autosave->post_modified_gmt, false ) > mysql
 $post_type_object = get_post_type_object( $post_type );
 
 // All meta boxes should be defined and added before the first do_meta_boxes() call (or potentially during the do_meta_boxes action).
-require_once( ABSPATH . 'wp-admin/includes/meta-boxes.php' );
+require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
 
 register_and_do_post_meta_boxes( $post );
 
@@ -416,7 +416,7 @@ if ( 'post' == $post_type ) {
 	);
 }
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
diff --git src/wp-admin/edit-form-blocks.php src/wp-admin/edit-form-blocks.php
index dcec9faaab..f2742ccf6b 100644
--- src/wp-admin/edit-form-blocks.php
+++ src/wp-admin/edit-form-blocks.php
@@ -361,7 +361,7 @@ wp_enqueue_style( 'wp-format-library' );
 do_action( 'enqueue_block_editor_assets' );
 
 // In order to duplicate classic meta box behaviour, we need to run the classic meta box actions.
-require_once( ABSPATH . 'wp-admin/includes/meta-boxes.php' );
+require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
 register_and_do_post_meta_boxes( $post );
 
 // Check if the Custom Fields meta box has been removed at some point.
@@ -399,7 +399,7 @@ $script = sprintf(
 );
 wp_add_inline_script( 'wp-edit-post', $script );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="block-editor">
diff --git src/wp-admin/edit-link-form.php src/wp-admin/edit-link-form.php
index 05c3751f72..7733d11508 100644
--- src/wp-admin/edit-link-form.php
+++ src/wp-admin/edit-link-form.php
@@ -25,7 +25,7 @@ if ( ! empty( $link_id ) ) {
 	$nonce_action = 'add-bookmark';
 }
 
-require_once( ABSPATH . 'wp-admin/includes/meta-boxes.php' );
+require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
 
 add_meta_box( 'linksubmitdiv', __( 'Save' ), 'link_submit_meta_box', null, 'side', 'core' );
 add_meta_box( 'linkcategorydiv', __( 'Categories' ), 'link_categories_meta_box', null, 'normal', 'core' );
@@ -77,7 +77,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
diff --git src/wp-admin/edit-tag-form.php src/wp-admin/edit-tag-form.php
index a56ee93ff7..46f86e6368 100644
--- src/wp-admin/edit-tag-form.php
+++ src/wp-admin/edit-tag-form.php
@@ -52,7 +52,7 @@ wp_reset_vars( array( 'wp_http_referer' ) );
 $wp_http_referer = remove_query_arg( array( 'action', 'message', 'tag_ID' ), $wp_http_referer );
 
 /** Also used by Edit Tags */
-require_once( ABSPATH . 'wp-admin/includes/edit-tag-messages.php' );
+require_once ABSPATH . 'wp-admin/includes/edit-tag-messages.php';
 
 /**
  * Fires before the Edit Term form for all taxonomies.
diff --git src/wp-admin/edit-tags.php src/wp-admin/edit-tags.php
index 580c70dc7a..2e9570b199 100644
--- src/wp-admin/edit-tags.php
+++ src/wp-admin/edit-tags.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! $taxnow ) {
 	wp_die( __( 'Invalid taxonomy.' ) );
@@ -318,10 +318,10 @@ if ( 'category' === $taxonomy || 'link_category' === $taxonomy || 'post_tag' ===
 	unset( $help );
 }
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 /** Also used by the Edit Tag  form */
-require_once( ABSPATH . 'wp-admin/includes/edit-tag-messages.php' );
+require_once ABSPATH . 'wp-admin/includes/edit-tag-messages.php';
 
 $class = ( isset( $_REQUEST['error'] ) ) ? 'error' : 'updated';
 
@@ -658,4 +658,4 @@ endif;
 
 $wp_list_table->inline_edit();
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/edit.php src/wp-admin/edit.php
index 5c818f4e4c..e57ed194b1 100644
--- src/wp-admin/edit.php
+++ src/wp-admin/edit.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! $typenow ) {
 	wp_die( __( 'Invalid post type.' ) );
@@ -383,7 +383,7 @@ $bulk_messages['wp_block'] = array(
 $bulk_messages = apply_filters( 'bulk_post_updated_messages', $bulk_messages, $bulk_counts );
 $bulk_counts   = array_filter( $bulk_counts );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap">
 <h1 class="wp-heading-inline">
@@ -461,4 +461,4 @@ if ( $wp_list_table->has_items() ) {
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/erase-personal-data.php src/wp-admin/erase-personal-data.php
index dc80022eef..931cafa150 100644
--- src/wp-admin/erase-personal-data.php
+++ src/wp-admin/erase-personal-data.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'erase_others_personal_data' ) || ! current_user_can( 'delete_users' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to erase data on this site.' ) );
@@ -47,7 +47,7 @@ $requests_table->screen->set_screen_reader_content(
 $requests_table->process_bulk_action();
 $requests_table->prepare_items();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap nosubsub">
@@ -89,4 +89,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/export-personal-data.php src/wp-admin/export-personal-data.php
index a4eef779c2..0a57169e36 100644
--- src/wp-admin/export-personal-data.php
+++ src/wp-admin/export-personal-data.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'export_others_personal_data' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to export personal data on this site.' ) );
@@ -47,7 +47,7 @@ $requests_table->screen->set_screen_reader_content(
 $requests_table->process_bulk_action();
 $requests_table->prepare_items();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap nosubsub">
@@ -89,4 +89,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/export.php src/wp-admin/export.php
index 759723456e..972d4590dc 100644
--- src/wp-admin/export.php
+++ src/wp-admin/export.php
@@ -7,14 +7,14 @@
  */
 
 /** Load WordPress Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'export' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to export the content of this site.' ) );
 }
 
 /** Load WordPress export API */
-require_once( ABSPATH . 'wp-admin/includes/export.php' );
+require_once ABSPATH . 'wp-admin/includes/export.php';
 $title = __( 'Export' );
 
 /**
@@ -122,7 +122,7 @@ if ( isset( $_GET['download'] ) ) {
 	die();
 }
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 /**
  * Create the date options fields for exporting a given post type.
@@ -321,4 +321,4 @@ do_action( 'export_filters' );
 </form>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/freedoms.php src/wp-admin/freedoms.php
index dcb2eeb794..b95e26c62d 100644
--- src/wp-admin/freedoms.php
+++ src/wp-admin/freedoms.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 // This file was used to also display the Privacy tab on the About screen from 4.9.6 until 5.3.0.
 if ( isset( $_GET['privacy-notice'] ) ) {
@@ -19,7 +19,7 @@ $title = __( 'Freedoms' );
 
 list( $display_version ) = explode( '-', get_bloginfo( 'version' ) );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap about__container">
 
@@ -123,4 +123,4 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 	</div>
 
 </div>
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/import.php src/wp-admin/import.php
index d10f60bde7..8536fb6e80 100644
--- src/wp-admin/import.php
+++ src/wp-admin/import.php
@@ -9,7 +9,7 @@
 define( 'WP_LOAD_IMPORTERS', true );
 
 /** Load WordPress Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'import' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to import content into this site.' ) );
@@ -53,7 +53,7 @@ add_thickbox();
 wp_enqueue_script( 'plugin-install' );
 wp_enqueue_script( 'updates' );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 $parent_file = 'tools.php';
 ?>
 
@@ -237,4 +237,4 @@ if ( current_user_can( 'install_plugins' ) ) {
 wp_print_request_filesystem_credentials_modal();
 wp_print_admin_notice_templates();
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/includes/admin.php src/wp-admin/includes/admin.php
index 8c3a3eb156..af828f75e9 100644
--- src/wp-admin/includes/admin.php
+++ src/wp-admin/includes/admin.php
@@ -17,83 +17,83 @@ if ( ! defined( 'WP_ADMIN' ) ) {
 }
 
 /** WordPress Administration Hooks */
-require_once( ABSPATH . 'wp-admin/includes/admin-filters.php' );
+require_once ABSPATH . 'wp-admin/includes/admin-filters.php';
 
 /** WordPress Bookmark Administration API */
-require_once( ABSPATH . 'wp-admin/includes/bookmark.php' );
+require_once ABSPATH . 'wp-admin/includes/bookmark.php';
 
 /** WordPress Comment Administration API */
-require_once( ABSPATH . 'wp-admin/includes/comment.php' );
+require_once ABSPATH . 'wp-admin/includes/comment.php';
 
 /** WordPress Administration File API */
-require_once( ABSPATH . 'wp-admin/includes/file.php' );
+require_once ABSPATH . 'wp-admin/includes/file.php';
 
 /** WordPress Image Administration API */
-require_once( ABSPATH . 'wp-admin/includes/image.php' );
+require_once ABSPATH . 'wp-admin/includes/image.php';
 
 /** WordPress Media Administration API */
-require_once( ABSPATH . 'wp-admin/includes/media.php' );
+require_once ABSPATH . 'wp-admin/includes/media.php';
 
 /** WordPress Import Administration API */
-require_once( ABSPATH . 'wp-admin/includes/import.php' );
+require_once ABSPATH . 'wp-admin/includes/import.php';
 
 /** WordPress Misc Administration API */
-require_once( ABSPATH . 'wp-admin/includes/misc.php' );
+require_once ABSPATH . 'wp-admin/includes/misc.php';
 
 /** WordPress Misc Administration API */
-require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php';
 
 /** WordPress Options Administration API */
-require_once( ABSPATH . 'wp-admin/includes/options.php' );
+require_once ABSPATH . 'wp-admin/includes/options.php';
 
 /** WordPress Plugin Administration API */
-require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
+require_once ABSPATH . 'wp-admin/includes/plugin.php';
 
 /** WordPress Post Administration API */
-require_once( ABSPATH . 'wp-admin/includes/post.php' );
+require_once ABSPATH . 'wp-admin/includes/post.php';
 
 /** WordPress Administration Screen API */
-require_once( ABSPATH . 'wp-admin/includes/class-wp-screen.php' );
-require_once( ABSPATH . 'wp-admin/includes/screen.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-screen.php';
+require_once ABSPATH . 'wp-admin/includes/screen.php';
 
 /** WordPress Taxonomy Administration API */
-require_once( ABSPATH . 'wp-admin/includes/taxonomy.php' );
+require_once ABSPATH . 'wp-admin/includes/taxonomy.php';
 
 /** WordPress Template Administration API */
-require_once( ABSPATH . 'wp-admin/includes/template.php' );
+require_once ABSPATH . 'wp-admin/includes/template.php';
 
 /** WordPress List Table Administration API and base class */
-require_once( ABSPATH . 'wp-admin/includes/class-wp-list-table.php' );
-require_once( ABSPATH . 'wp-admin/includes/class-wp-list-table-compat.php' );
-require_once( ABSPATH . 'wp-admin/includes/list-table.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-list-table.php';
+require_once ABSPATH . 'wp-admin/includes/class-wp-list-table-compat.php';
+require_once ABSPATH . 'wp-admin/includes/list-table.php';
 
 /** WordPress Theme Administration API */
-require_once( ABSPATH . 'wp-admin/includes/theme.php' );
+require_once ABSPATH . 'wp-admin/includes/theme.php';
 
 /** WordPress Privacy Functions */
-require_once( ABSPATH . 'wp-admin/includes/privacy-tools.php' );
+require_once ABSPATH . 'wp-admin/includes/privacy-tools.php';
 
 /** WordPress Privacy List Table classes. */
 // Previously in wp-admin/includes/user.php. Need to be loaded for backwards compatibility.
-require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php' );
-require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php' );
-require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php';
+require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php';
+require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php';
 
 /** WordPress User Administration API */
-require_once( ABSPATH . 'wp-admin/includes/user.php' );
+require_once ABSPATH . 'wp-admin/includes/user.php';
 
 /** WordPress Site Icon API */
-require_once( ABSPATH . 'wp-admin/includes/class-wp-site-icon.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-site-icon.php';
 
 /** WordPress Update Administration API */
-require_once( ABSPATH . 'wp-admin/includes/update.php' );
+require_once ABSPATH . 'wp-admin/includes/update.php';
 
 /** WordPress Deprecated Administration API */
-require_once( ABSPATH . 'wp-admin/includes/deprecated.php' );
+require_once ABSPATH . 'wp-admin/includes/deprecated.php';
 
 /** WordPress Multisite support API */
 if ( is_multisite() ) {
-	require_once( ABSPATH . 'wp-admin/includes/ms-admin-filters.php' );
-	require_once( ABSPATH . 'wp-admin/includes/ms.php' );
-	require_once( ABSPATH . 'wp-admin/includes/ms-deprecated.php' );
+	require_once ABSPATH . 'wp-admin/includes/ms-admin-filters.php';
+	require_once ABSPATH . 'wp-admin/includes/ms.php';
+	require_once ABSPATH . 'wp-admin/includes/ms-deprecated.php';
 }
diff --git src/wp-admin/includes/ajax-actions.php src/wp-admin/includes/ajax-actions.php
index 495693c313..686fc84cd5 100644
--- src/wp-admin/includes/ajax-actions.php
+++ src/wp-admin/includes/ajax-actions.php
@@ -234,7 +234,7 @@ function wp_ajax_imgedit_preview() {
 
 	check_ajax_referer( "image_editor-$post_id" );
 
-	include_once( ABSPATH . 'wp-admin/includes/image-edit.php' );
+	include_once ABSPATH . 'wp-admin/includes/image-edit.php';
 
 	if ( ! stream_preview_image( $post_id ) ) {
 		wp_die( -1 );
@@ -336,7 +336,7 @@ function wp_ajax_autocomplete_user() {
  * @since 4.8.0
  */
 function wp_ajax_get_community_events() {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-community-events.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-community-events.php';
 
 	check_ajax_referer( 'community_events' );
 
@@ -1342,7 +1342,7 @@ function wp_ajax_replyto_comment( $action ) {
 
 	ob_start();
 	if ( isset( $_REQUEST['mode'] ) && 'dashboard' == $_REQUEST['mode'] ) {
-		require_once( ABSPATH . 'wp-admin/includes/dashboard.php' );
+		require_once ABSPATH . 'wp-admin/includes/dashboard.php';
 		_wp_dashboard_recent_comments_row( $comment );
 	} else {
 		if ( isset( $_REQUEST['mode'] ) && 'single' == $_REQUEST['mode'] ) {
@@ -1851,7 +1851,7 @@ function wp_ajax_wp_link_ajax() {
 	$args['pagenum'] = ! empty( $_POST['page'] ) ? absint( $_POST['page'] ) : 1;
 
 	if ( ! class_exists( '_WP_Editors', false ) ) {
-		require( ABSPATH . WPINC . '/class-wp-editor.php' );
+		require ABSPATH . WPINC . '/class-wp-editor.php';
 	}
 
 	$results = _WP_Editors::wp_link_query( $args );
@@ -2593,7 +2593,7 @@ function wp_ajax_image_editor() {
 	}
 
 	check_ajax_referer( "image_editor-$attachment_id" );
-	include_once( ABSPATH . 'wp-admin/includes/image-edit.php' );
+	include_once ABSPATH . 'wp-admin/includes/image-edit.php';
 
 	$msg = false;
 	switch ( $_POST['do'] ) {
@@ -4000,8 +4000,8 @@ function wp_ajax_install_theme() {
 		wp_send_json_error( $status );
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
-	include_once( ABSPATH . 'wp-admin/includes/theme.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include_once ABSPATH . 'wp-admin/includes/theme.php';
 
 	$api = themes_api(
 		'theme_information',
@@ -4129,7 +4129,7 @@ function wp_ajax_update_theme() {
 		$status['oldVersion'] = $theme->get( 'Version' );
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	$current = get_site_transient( 'update_themes' );
 	if ( empty( $current ) ) {
@@ -4243,7 +4243,7 @@ function wp_ajax_delete_theme() {
 		wp_send_json_error( $status );
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/theme.php' );
+	include_once ABSPATH . 'wp-admin/includes/theme.php';
 
 	$result = delete_theme( $stylesheet );
 
@@ -4290,8 +4290,8 @@ function wp_ajax_install_plugin() {
 		wp_send_json_error( $status );
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
-	include_once( ABSPATH . 'wp-admin/includes/plugin-install.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include_once ABSPATH . 'wp-admin/includes/plugin-install.php';
 
 	$api = plugins_api(
 		'plugin_information',
@@ -4412,7 +4412,7 @@ function wp_ajax_update_plugin() {
 		$status['oldVersion'] = sprintf( __( 'Version %s' ), $plugin_data['Version'] );
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	wp_update_plugins();
 
@@ -5115,7 +5115,7 @@ function wp_ajax_health_check_dotorg_communication() {
 	}
 
 	if ( ! class_exists( 'WP_Site_Health' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 	}
 
 	$site_health = new WP_Site_Health();
@@ -5135,7 +5135,7 @@ function wp_ajax_health_check_is_in_debug_mode() {
 	}
 
 	if ( ! class_exists( 'WP_Site_Health' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 	}
 
 	$site_health = new WP_Site_Health();
@@ -5155,7 +5155,7 @@ function wp_ajax_health_check_background_updates() {
 	}
 
 	if ( ! class_exists( 'WP_Site_Health' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 	}
 
 	$site_health = new WP_Site_Health();
@@ -5176,7 +5176,7 @@ function wp_ajax_health_check_loopback_requests() {
 	}
 
 	if ( ! class_exists( 'WP_Site_Health' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 	}
 
 	$site_health = new WP_Site_Health();
@@ -5213,7 +5213,7 @@ function wp_ajax_health_check_get_sizes() {
 	}
 
 	if ( ! class_exists( 'WP_Debug_Data' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-debug-data.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-debug-data.php';
 	}
 
 	$sizes_data = WP_Debug_Data::get_sizes();
diff --git src/wp-admin/includes/class-core-upgrader.php src/wp-admin/includes/class-core-upgrader.php
index dd3f540dda..071908014f 100644
--- src/wp-admin/includes/class-core-upgrader.php
+++ src/wp-admin/includes/class-core-upgrader.php
@@ -62,7 +62,7 @@ class Core_Upgrader extends WP_Upgrader {
 	public function upgrade( $current, $args = array() ) {
 		global $wp_filesystem;
 
-		include( ABSPATH . WPINC . '/version.php' ); // $wp_version;
+		include ABSPATH . WPINC . '/version.php'; // $wp_version;
 
 		$start_time = time();
 
@@ -161,7 +161,7 @@ class Core_Upgrader extends WP_Upgrader {
 		}
 		$wp_filesystem->chmod( $wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE );
 
-		require_once( ABSPATH . 'wp-admin/includes/update-core.php' );
+		require_once ABSPATH . 'wp-admin/includes/update-core.php';
 
 		if ( ! function_exists( 'update_core' ) ) {
 			WP_Upgrader::release_lock( 'core_updater' );
@@ -270,7 +270,7 @@ class Core_Upgrader extends WP_Upgrader {
 	 * @return bool True if we should update to the offered version, otherwise false.
 	 */
 	public static function should_update_to_version( $offered_ver ) {
-		include( ABSPATH . WPINC . '/version.php' ); // $wp_version; // x.y.z
+		include ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z
 
 		$current_branch                 = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version ), 0, 2 ) ); // x.y
 		$new_branch                     = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y
diff --git src/wp-admin/includes/class-ftp.php src/wp-admin/includes/class-ftp.php
index a377640c65..8e2624cedc 100644
--- src/wp-admin/includes/class-ftp.php
+++ src/wp-admin/includes/class-ftp.php
@@ -903,7 +903,7 @@ if ( ! $mod_sockets && function_exists( 'dl' ) && is_callable( 'dl' ) ) {
 	$mod_sockets = extension_loaded( 'sockets' );
 }
 
-require_once dirname( __FILE__ ) . "/class-ftp-" . ( $mod_sockets ? "sockets" : "pure" ) . ".php";
+require_once __DIR__ . "/class-ftp-" . ( $mod_sockets ? "sockets" : "pure" ) . ".php";
 
 if ( $mod_sockets ) {
 	class ftp extends ftp_sockets {}
diff --git src/wp-admin/includes/class-wp-community-events.php src/wp-admin/includes/class-wp-community-events.php
index 776d72f2f2..b2c9d01a78 100644
--- src/wp-admin/includes/class-wp-community-events.php
+++ src/wp-admin/includes/class-wp-community-events.php
@@ -93,7 +93,7 @@ class WP_Community_Events {
 		}
 
 		// include an unmodified $wp_version
-		include( ABSPATH . WPINC . '/version.php' );
+		include ABSPATH . WPINC . '/version.php';
 
 		$api_url                    = 'http://api.wordpress.org/events/1.0/';
 		$request_args               = $this->get_request_args( $location_search, $timezone );
diff --git src/wp-admin/includes/class-wp-plugin-install-list-table.php src/wp-admin/includes/class-wp-plugin-install-list-table.php
index acea5c4b28..48ffcfe9f3 100644
--- src/wp-admin/includes/class-wp-plugin-install-list-table.php
+++ src/wp-admin/includes/class-wp-plugin-install-list-table.php
@@ -85,7 +85,7 @@ class WP_Plugin_Install_List_Table extends WP_List_Table {
 	 * @global string $term
 	 */
 	public function prepare_items() {
-		include_once( ABSPATH . 'wp-admin/includes/plugin-install.php' );
+		include_once ABSPATH . 'wp-admin/includes/plugin-install.php';
 
 		global $tabs, $tab, $paged, $type, $term;
 
diff --git src/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php src/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php
index 683ea69697..880af8cd04 100644
--- src/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php
+++ src/wp-admin/includes/class-wp-privacy-data-export-requests-list-table.php
@@ -8,7 +8,7 @@
  */
 
 if ( ! class_exists( 'WP_Privacy_Requests_Table' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php';
 }
 
 /**
diff --git src/wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php src/wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php
index 8e2efa0379..b894865064 100644
--- src/wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php
+++ src/wp-admin/includes/class-wp-privacy-data-removal-requests-list-table.php
@@ -8,7 +8,7 @@
  */
 
 if ( ! class_exists( 'WP_Privacy_Requests_Table' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-requests-table.php';
 }
 
 /**
diff --git src/wp-admin/includes/class-wp-site-health-auto-updates.php src/wp-admin/includes/class-wp-site-health-auto-updates.php
index 05fbba9085..2d7c64e050 100644
--- src/wp-admin/includes/class-wp-site-health-auto-updates.php
+++ src/wp-admin/includes/class-wp-site-health-auto-updates.php
@@ -166,7 +166,7 @@ class WP_Site_Health_Auto_Updates {
 	 */
 	public function test_wp_automatic_updates_disabled() {
 		if ( ! class_exists( 'WP_Automatic_Updater' ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-wp-automatic-updates.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-wp-automatic-updates.php';
 		}
 
 		$auto_updates = new WP_Automatic_Updater();
diff --git src/wp-admin/includes/class-wp-site-health.php src/wp-admin/includes/class-wp-site-health.php
index 0da1f9e607..8f52c87ee2 100644
--- src/wp-admin/includes/class-wp-site-health.php
+++ src/wp-admin/includes/class-wp-site-health.php
@@ -1632,7 +1632,7 @@ class WP_Site_Health {
 		);
 
 		if ( ! class_exists( 'WP_Site_Health_Auto_Updates' ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health-auto-updates.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-wp-site-health-auto-updates.php';
 		}
 
 		// Run the auto-update tests in a separate class,
@@ -2223,7 +2223,7 @@ class WP_Site_Health {
 	 */
 	public function wp_cron_scheduled_check() {
 		// Bootstrap wp-admin, as WP_Cron doesn't do this for us.
-		require_once( trailingslashit( ABSPATH ) . 'wp-admin/includes/admin.php' );
+		require_once trailingslashit( ABSPATH ) . 'wp-admin/includes/admin.php';
 
 		$tests = WP_Site_Health::get_tests();
 
diff --git src/wp-admin/includes/class-wp-theme-install-list-table.php src/wp-admin/includes/class-wp-theme-install-list-table.php
index 637785f392..4105d0ab74 100644
--- src/wp-admin/includes/class-wp-theme-install-list-table.php
+++ src/wp-admin/includes/class-wp-theme-install-list-table.php
@@ -34,7 +34,7 @@ class WP_Theme_Install_List_Table extends WP_Themes_List_Table {
 	 * @global array  $theme_field_defaults
 	 */
 	public function prepare_items() {
-		include( ABSPATH . 'wp-admin/includes/theme-install.php' );
+		include ABSPATH . 'wp-admin/includes/theme-install.php';
 
 		global $tabs, $tab, $paged, $type, $theme_field_defaults;
 		wp_reset_vars( array( 'tab' ) );
diff --git src/wp-admin/includes/comment.php src/wp-admin/includes/comment.php
index e99f8a6a50..e0ff389abe 100644
--- src/wp-admin/includes/comment.php
+++ src/wp-admin/includes/comment.php
@@ -208,6 +208,6 @@ function enqueue_comment_hotkeys_js() {
  */
 function comment_footer_die( $msg ) {
 	echo "<div class='wrap'><p>$msg</p></div>";
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 	die;
 }
diff --git src/wp-admin/includes/credits.php src/wp-admin/includes/credits.php
index 3289c18e4a..885e499be1 100644
--- src/wp-admin/includes/credits.php
+++ src/wp-admin/includes/credits.php
@@ -16,7 +16,7 @@
  */
 function wp_credits() {
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	$locale = get_user_locale();
 
diff --git src/wp-admin/includes/dashboard.php src/wp-admin/includes/dashboard.php
index 6ecc49f8f1..de9f664f27 100644
--- src/wp-admin/includes/dashboard.php
+++ src/wp-admin/includes/dashboard.php
@@ -45,7 +45,7 @@ function wp_dashboard_setup() {
 	// Site Health.
 	if ( current_user_can( 'view_site_health_checks' ) ) {
 		if ( ! class_exists( 'WP_Site_Health' ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 		}
 
 		WP_Site_Health::initialize();
@@ -1665,7 +1665,7 @@ function wp_check_browser_version() {
 	$response = get_site_transient( 'browser_' . $key );
 	if ( false === $response ) {
 		// Include an unmodified $wp_version.
-		include( ABSPATH . WPINC . '/version.php' );
+		include ABSPATH . WPINC . '/version.php';
 
 		$url     = 'http://api.wordpress.org/core/browse-happy/1.1/';
 		$options = array(
diff --git src/wp-admin/includes/deprecated.php src/wp-admin/includes/deprecated.php
index a16f0e98c7..521be4544a 100644
--- src/wp-admin/includes/deprecated.php
+++ src/wp-admin/includes/deprecated.php
@@ -762,7 +762,7 @@ function wp_tiny_mce( $teeny = false, $settings = false ) {
 	static $num = 1;
 
 	if ( ! class_exists( '_WP_Editors', false ) )
-		require_once( ABSPATH . WPINC . '/class-wp-editor.php' );
+		require_once ABSPATH . WPINC . '/class-wp-editor.php';
 
 	$editor_id = 'content' . $num++;
 
@@ -1156,7 +1156,7 @@ function wp_update_core($current, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 	$upgrader = new Core_Upgrader();
 	return $upgrader->upgrade($current);
 
@@ -1179,7 +1179,7 @@ function wp_update_plugin($plugin, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 	$upgrader = new Plugin_Upgrader();
 	return $upgrader->upgrade($plugin);
 }
@@ -1201,7 +1201,7 @@ function wp_update_theme($theme, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 	$upgrader = new Theme_Upgrader();
 	return $upgrader->upgrade($theme);
 }
diff --git src/wp-admin/includes/file.php src/wp-admin/includes/file.php
index 0c65f2c6e3..b2a939b81a 100644
--- src/wp-admin/includes/file.php
+++ src/wp-admin/includes/file.php
@@ -1597,7 +1597,7 @@ function _unzip_file_pclzip( $file, $to, $needed_dirs = array() ) {
 
 	mbstring_binary_safe_encoding();
 
-	require_once( ABSPATH . 'wp-admin/includes/class-pclzip.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-pclzip.php';
 
 	$archive = new PclZip( $file );
 
@@ -1769,7 +1769,7 @@ function copy_dir( $from, $to, $skip_list = array() ) {
 function WP_Filesystem( $args = false, $context = false, $allow_relaxed_file_ownership = false ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
 	global $wp_filesystem;
 
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
 
 	$method = get_filesystem_method( $args, $context, $allow_relaxed_file_ownership );
 
@@ -1795,7 +1795,7 @@ function WP_Filesystem( $args = false, $context = false, $allow_relaxed_file_own
 			return;
 		}
 
-		require_once( $abstraction_file );
+		require_once $abstraction_file;
 	}
 	$method = "WP_Filesystem_$method";
 
diff --git src/wp-admin/includes/import.php src/wp-admin/includes/import.php
index 52b623a447..c23fce6274 100644
--- src/wp-admin/includes/import.php
+++ src/wp-admin/includes/import.php
@@ -136,7 +136,7 @@ function wp_import_handle_upload() {
  * @return array Importers with metadata for each.
  */
 function wp_get_popular_importers() {
-	include( ABSPATH . WPINC . '/version.php' ); // Include an unmodified $wp_version.
+	include ABSPATH . WPINC . '/version.php'; // Include an unmodified $wp_version.
 
 	$locale            = get_user_locale();
 	$cache_key         = 'popular_importers_' . md5( $locale . $wp_version );
diff --git src/wp-admin/includes/list-table.php src/wp-admin/includes/list-table.php
index 881bb37388..dce5eef702 100644
--- src/wp-admin/includes/list-table.php
+++ src/wp-admin/includes/list-table.php
@@ -46,7 +46,7 @@ function _get_list_table( $class, $args = array() ) {
 
 	if ( isset( $core_classes[ $class ] ) ) {
 		foreach ( (array) $core_classes[ $class ] as $required ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-wp-' . $required . '-list-table.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-wp-' . $required . '-list-table.php';
 		}
 
 		if ( isset( $args['screen'] ) ) {
diff --git src/wp-admin/includes/media.php src/wp-admin/includes/media.php
index f52e9a4704..17b8345cdf 100644
--- src/wp-admin/includes/media.php
+++ src/wp-admin/includes/media.php
@@ -3458,7 +3458,7 @@ function wp_read_video_metadata( $file ) {
 	}
 
 	if ( ! class_exists( 'getID3', false ) ) {
-		require( ABSPATH . WPINC . '/ID3/getid3.php' );
+		require ABSPATH . WPINC . '/ID3/getid3.php';
 	}
 
 	$id3  = new getID3();
@@ -3569,7 +3569,7 @@ function wp_read_audio_metadata( $file ) {
 	}
 
 	if ( ! class_exists( 'getID3', false ) ) {
-		require( ABSPATH . WPINC . '/ID3/getid3.php' );
+		require ABSPATH . WPINC . '/ID3/getid3.php';
 	}
 
 	$id3  = new getID3();
diff --git src/wp-admin/includes/misc.php src/wp-admin/includes/misc.php
index 8903a280ed..64b4d3c2a2 100644
--- src/wp-admin/includes/misc.php
+++ src/wp-admin/includes/misc.php
@@ -254,7 +254,7 @@ function save_mod_rewrite_rules() {
 	global $wp_rewrite;
 
 	// Ensure get_home_path() is declared.
-	require_once( ABSPATH . 'wp-admin/includes/file.php' );
+	require_once ABSPATH . 'wp-admin/includes/file.php';
 
 	$home_path     = get_home_path();
 	$htaccess_file = $home_path . '.htaccess';
@@ -291,7 +291,7 @@ function iis7_save_url_rewrite_rules() {
 	global $wp_rewrite;
 
 	// Ensure get_home_path() is declared.
-	require_once( ABSPATH . 'wp-admin/includes/file.php' );
+	require_once ABSPATH . 'wp-admin/includes/file.php';
 
 	$home_path       = get_home_path();
 	$web_config_file = $home_path . 'web.config';
diff --git src/wp-admin/includes/nav-menu.php src/wp-admin/includes/nav-menu.php
index 9b321ff4f3..b5d0bad956 100644
--- src/wp-admin/includes/nav-menu.php
+++ src/wp-admin/includes/nav-menu.php
@@ -8,10 +8,10 @@
  */
 
 /** Walker_Nav_Menu_Edit class */
-require_once( ABSPATH . 'wp-admin/includes/class-walker-nav-menu-edit.php' );
+require_once ABSPATH . 'wp-admin/includes/class-walker-nav-menu-edit.php';
 
 /** Walker_Nav_Menu_Checklist class */
-require_once( ABSPATH . 'wp-admin/includes/class-walker-nav-menu-checklist.php' );
+require_once ABSPATH . 'wp-admin/includes/class-walker-nav-menu-checklist.php';
 
 /**
  * Prints the appropriate response to a menu quick search.
diff --git src/wp-admin/includes/network.php src/wp-admin/includes/network.php
index b814adcf2c..c29ba514d4 100644
--- src/wp-admin/includes/network.php
+++ src/wp-admin/includes/network.php
@@ -116,7 +116,7 @@ function network_step1( $errors = false ) {
 			'<code>DO_NOT_UPGRADE_GLOBAL_TABLES</code>'
 		) . '</p></div>';
 		echo '</div>';
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 		die();
 	}
 
@@ -129,7 +129,7 @@ function network_step1( $errors = false ) {
 		) . '</p></div>';
 		echo '<p>' . __( 'Once the network is created, you may reactivate your plugins.' ) . '</p>';
 		echo '</div>';
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 		die();
 	}
 
@@ -144,7 +144,7 @@ function network_step1( $errors = false ) {
 		) . '</p>';
 		echo '<a href="' . esc_url( admin_url() ) . '">' . __( 'Return to Dashboard' ) . '</a>';
 		echo '</div>';
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 		die();
 	}
 
diff --git src/wp-admin/includes/plugin-install.php src/wp-admin/includes/plugin-install.php
index 6e56b33669..9a80b417d6 100644
--- src/wp-admin/includes/plugin-install.php
+++ src/wp-admin/includes/plugin-install.php
@@ -101,7 +101,7 @@
  */
 function plugins_api( $action, $args = array() ) {
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	if ( is_array( $args ) ) {
 		$args = (object) $args;
diff --git src/wp-admin/includes/plugin.php src/wp-admin/includes/plugin.php
index ff87539798..75eff7b7d3 100644
--- src/wp-admin/includes/plugin.php
+++ src/wp-admin/includes/plugin.php
@@ -647,7 +647,7 @@ function activate_plugin( $plugin, $redirect = '', $network_wide = false, $silen
 		if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
 			define( 'WP_SANDBOX_SCRAPING', true );
 		}
-		include_once( WP_PLUGIN_DIR . '/' . $plugin );
+		include_once WP_PLUGIN_DIR . '/' . $plugin;
 		$plugin = $_wp_plugin_file; // Avoid stomping of the $plugin variable in a plugin.
 
 		if ( ! $silent ) {
@@ -898,9 +898,9 @@ function delete_plugins( $plugins, $deprecated = '' ) {
 
 	if ( false === $credentials ) {
 		if ( ! empty( $data ) ) {
-			include_once( ABSPATH . 'wp-admin/admin-header.php' );
+			include_once ABSPATH . 'wp-admin/admin-header.php';
 			echo $data;
-			include( ABSPATH . 'wp-admin/admin-footer.php' );
+			include ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 		}
 		return;
@@ -912,9 +912,9 @@ function delete_plugins( $plugins, $deprecated = '' ) {
 		$data = ob_get_clean();
 
 		if ( ! empty( $data ) ) {
-			include_once( ABSPATH . 'wp-admin/admin-header.php' );
+			include_once ABSPATH . 'wp-admin/admin-header.php';
 			echo $data;
-			include( ABSPATH . 'wp-admin/admin-footer.php' );
+			include ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 		}
 		return;
@@ -1208,7 +1208,7 @@ function uninstall_plugin( $plugin ) {
 
 		define( 'WP_UNINSTALL_PLUGIN', $file );
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
-		include( WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php' );
+		include WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php';
 
 		return true;
 	}
@@ -1220,7 +1220,7 @@ function uninstall_plugin( $plugin ) {
 		unset( $uninstallable_plugins );
 
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
-		include( WP_PLUGIN_DIR . '/' . $file );
+		include WP_PLUGIN_DIR . '/' . $file;
 
 		add_action( "uninstall_{$file}", $callable );
 
@@ -2241,7 +2241,7 @@ function plugin_sandbox_scrape( $plugin ) {
 		define( 'WP_SANDBOX_SCRAPING', true );
 	}
 	wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
-	include( WP_PLUGIN_DIR . '/' . $plugin );
+	include WP_PLUGIN_DIR . '/' . $plugin;
 }
 
 /**
@@ -2291,7 +2291,7 @@ function wp_add_privacy_policy_content( $plugin_name, $policy_text ) {
 	}
 
 	if ( ! class_exists( 'WP_Privacy_Policy_Content' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php' );
+		require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php';
 	}
 
 	WP_Privacy_Policy_Content::add( $plugin_name, $policy_text );
diff --git src/wp-admin/includes/template.php src/wp-admin/includes/template.php
index 3ed611d0c4..e2aa398cdc 100644
--- src/wp-admin/includes/template.php
+++ src/wp-admin/includes/template.php
@@ -9,10 +9,10 @@
  */
 
 /** Walker_Category_Checklist class */
-require_once( ABSPATH . 'wp-admin/includes/class-walker-category-checklist.php' );
+require_once ABSPATH . 'wp-admin/includes/class-walker-category-checklist.php';
 
 /** WP_Internal_Pointers class */
-require_once( ABSPATH . 'wp-admin/includes/class-wp-internal-pointers.php' );
+require_once ABSPATH . 'wp-admin/includes/class-wp-internal-pointers.php';
 
 //
 // Category Checklists
diff --git src/wp-admin/includes/theme.php src/wp-admin/includes/theme.php
index 2e8e0172d4..31e172b9ff 100644
--- src/wp-admin/includes/theme.php
+++ src/wp-admin/includes/theme.php
@@ -35,9 +35,9 @@ function delete_theme( $stylesheet, $redirect = '' ) {
 
 	if ( false === $credentials ) {
 		if ( ! empty( $data ) ) {
-			include_once( ABSPATH . 'wp-admin/admin-header.php' );
+			include_once ABSPATH . 'wp-admin/admin-header.php';
 			echo $data;
-			include( ABSPATH . 'wp-admin/admin-footer.php' );
+			include ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 		}
 		return;
@@ -49,9 +49,9 @@ function delete_theme( $stylesheet, $redirect = '' ) {
 		$data = ob_get_clean();
 
 		if ( ! empty( $data ) ) {
-			include_once( ABSPATH . 'wp-admin/admin-header.php' );
+			include_once ABSPATH . 'wp-admin/admin-header.php';
 			echo $data;
-			include( ABSPATH . 'wp-admin/admin-footer.php' );
+			include ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 		}
 		return;
@@ -434,7 +434,7 @@ function get_theme_feature_list( $api = true ) {
  */
 function themes_api( $action, $args = array() ) {
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	if ( is_array( $args ) ) {
 		$args = (object) $args;
diff --git src/wp-admin/includes/translation-install.php src/wp-admin/includes/translation-install.php
index 6296f07c74..1336eb87a3 100644
--- src/wp-admin/includes/translation-install.php
+++ src/wp-admin/includes/translation-install.php
@@ -17,7 +17,7 @@
  * @return object|WP_Error On success an object of translations, WP_Error on failure.
  */
 function translations_api( $type, $args = null ) {
-	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
+	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 
 	if ( ! in_array( $type, array( 'plugins', 'themes', 'core' ) ) ) {
 		return  new WP_Error( 'invalid_type', __( 'Invalid translation type.' ) );
@@ -126,7 +126,7 @@ function wp_get_available_translations() {
 		}
 	}
 
-	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
+	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 
 	$api = translations_api( 'core', array( 'version' => $wp_version ) );
 
diff --git src/wp-admin/includes/update-core.php src/wp-admin/includes/update-core.php
index 48e3e1277b..6bf368a17f 100644
--- src/wp-admin/includes/update-core.php
+++ src/wp-admin/includes/update-core.php
@@ -933,7 +933,7 @@ function update_core( $from, $to ) {
 	}
 
 	$wp_filesystem->chmod( $versions_file, FS_CHMOD_FILE );
-	require( WP_CONTENT_DIR . '/upgrade/version-current.php' );
+	require WP_CONTENT_DIR . '/upgrade/version-current.php';
 	$wp_filesystem->delete( $versions_file );
 
 	$php_version       = phpversion();
@@ -1424,7 +1424,7 @@ window.location = 'about.php?updated';
 	<?php
 
 	// Include admin-footer.php and exit.
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 	exit();
 }
 
diff --git src/wp-admin/includes/update.php src/wp-admin/includes/update.php
index 0caa04a963..997a63ef0c 100644
--- src/wp-admin/includes/update.php
+++ src/wp-admin/includes/update.php
@@ -90,7 +90,7 @@ function find_core_auto_update() {
 		return false;
 	}
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	$auto_update = false;
 	$upgrader    = new WP_Automatic_Updater;
@@ -723,7 +723,7 @@ function wp_theme_update_row( $theme_key, $theme ) {
  * @return void|false
  */
 function maintenance_nag() {
-	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
+	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 	global $upgrading;
 	$nag = isset( $upgrading );
 	if ( ! $nag ) {
diff --git src/wp-admin/includes/upgrade.php src/wp-admin/includes/upgrade.php
index 505b0aad17..cd5acbf70d 100644
--- src/wp-admin/includes/upgrade.php
+++ src/wp-admin/includes/upgrade.php
@@ -10,14 +10,14 @@
 
 /** Include user installation customization script. */
 if ( file_exists( WP_CONTENT_DIR . '/install.php' ) ) {
-	require( WP_CONTENT_DIR . '/install.php' );
+	require WP_CONTENT_DIR . '/install.php';
 }
 
 /** WordPress Administration API */
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
 
 /** WordPress Schema API */
-require_once( ABSPATH . 'wp-admin/includes/schema.php' );
+require_once ABSPATH . 'wp-admin/includes/schema.php';
 
 if ( ! function_exists( 'wp_install' ) ) :
 	/**
@@ -358,7 +358,7 @@ Commenter avatars come from <a href="https://gravatar.com">Gravatar</a>.'
 			$privacy_policy_content = get_site_option( 'default_privacy_policy_content' );
 		} else {
 			if ( ! class_exists( 'WP_Privacy_Policy_Content' ) ) {
-				include_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php' );
+				include_once ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php';
 			}
 
 			$privacy_policy_content = WP_Privacy_Policy_Content::get_default_content();
diff --git src/wp-admin/index.php src/wp-admin/index.php
index 6db93a9df4..50b7f4046f 100644
--- src/wp-admin/index.php
+++ src/wp-admin/index.php
@@ -6,9 +6,9 @@
  * please refer to wp-admin/_index.php.
  */
 
-if ( file_exists( dirname( __FILE__ ) . '/../wp-includes/js/dist/edit-post.js' ) ) {
-	require_once dirname( __FILE__ ) . '/_index.php';
+if ( file_exists( __DIR__ . '/../wp-includes/js/dist/edit-post.js' ) ) {
+	require_once __DIR__ . '/_index.php';
 	return;
 }
 
-require_once dirname( dirname( __FILE__ ) ) . '/index.php';
+require_once dirname( __DIR__ ) . '/index.php';
diff --git src/wp-admin/install-helper.php src/wp-admin/install-helper.php
index 432a4a9fa5..1c545759b0 100644
--- src/wp-admin/install-helper.php
+++ src/wp-admin/install-helper.php
@@ -35,7 +35,7 @@
  */
 
 /** Load WordPress Bootstrap */
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 if ( ! function_exists( 'maybe_create_table' ) ) :
 	/**
diff --git src/wp-admin/install.php src/wp-admin/install.php
index 68408c9c41..d0214c30e8 100644
--- src/wp-admin/install.php
+++ src/wp-admin/install.php
@@ -33,16 +33,16 @@ if ( false ) {
 define( 'WP_INSTALLING', true );
 
 /** Load WordPress Bootstrap */
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 /** Load WordPress Administration Upgrade API */
-require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 /** Load WordPress Translation Install API */
-require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 /** Load wpdb */
-require_once( ABSPATH . WPINC . '/wp-db.php' );
+require_once ABSPATH . WPINC . '/wp-db.php';
 
 nocache_headers();
 
diff --git src/wp-admin/link-add.php src/wp-admin/link-add.php
index ff617d5777..83cf4036f3 100644
--- src/wp-admin/link-add.php
+++ src/wp-admin/link-add.php
@@ -7,7 +7,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_links' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to add links to this site.' ) );
@@ -26,6 +26,6 @@ if ( wp_is_mobile() ) {
 }
 
 $link = get_default_link_to_edit();
-include( ABSPATH . 'wp-admin/edit-link-form.php' );
+include ABSPATH . 'wp-admin/edit-link-form.php';
 
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/link-manager.php src/wp-admin/link-manager.php
index 1ca9bf64b3..21158367fc 100644
--- src/wp-admin/link-manager.php
+++ src/wp-admin/link-manager.php
@@ -7,7 +7,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 if ( ! current_user_can( 'manage_links' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to edit the links for this site.' ) );
 }
@@ -85,7 +85,7 @@ get_current_screen()->set_screen_reader_content(
 	)
 );
 
-include_once( ABSPATH . 'wp-admin/admin-header.php' );
+include_once ABSPATH . 'wp-admin/admin-header.php';
 
 if ( ! current_user_can( 'manage_links' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to edit the links for this site.' ) );
@@ -134,4 +134,4 @@ if ( isset( $_REQUEST['deleted'] ) ) {
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/link.php src/wp-admin/link.php
index ef5b26a515..32d38a11ad 100644
--- src/wp-admin/link.php
+++ src/wp-admin/link.php
@@ -10,7 +10,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_reset_vars( array( 'action', 'cat_id', 'link_id' ) );
 
@@ -117,8 +117,8 @@ switch ( $action ) {
 			wp_die( __( 'Link not found.' ) );
 		}
 
-		include( ABSPATH . 'wp-admin/edit-link-form.php' );
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/edit-link-form.php';
+		include ABSPATH . 'wp-admin/admin-footer.php';
 		break;
 
 	default:
diff --git src/wp-admin/load-scripts.php src/wp-admin/load-scripts.php
index bdb5fa5cec..b47ab04f8b 100644
--- src/wp-admin/load-scripts.php
+++ src/wp-admin/load-scripts.php
@@ -9,7 +9,7 @@ error_reporting( 0 );
 
 /** Set ABSPATH for execution */
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
+	define( 'ABSPATH', dirname( __DIR__ ) . '/' );
 }
 
 define( 'WPINC', 'wp-includes' );
@@ -33,9 +33,9 @@ if ( empty( $load ) ) {
 	exit;
 }
 
-require( ABSPATH . 'wp-admin/includes/noop.php' );
-require( ABSPATH . WPINC . '/script-loader.php' );
-require( ABSPATH . WPINC . '/version.php' );
+require ABSPATH . 'wp-admin/includes/noop.php';
+require ABSPATH . WPINC . '/script-loader.php';
+require ABSPATH . WPINC . '/version.php';
 
 $expires_offset = 31536000; // 1 year
 $out            = '';
diff --git src/wp-admin/load-styles.php src/wp-admin/load-styles.php
index 8b3cc0d75f..138846698d 100644
--- src/wp-admin/load-styles.php
+++ src/wp-admin/load-styles.php
@@ -9,14 +9,14 @@ error_reporting( 0 );
 
 /** Set ABSPATH for execution */
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
+	define( 'ABSPATH', dirname( __DIR__ ) . '/' );
 }
 
 define( 'WPINC', 'wp-includes' );
 
-require( ABSPATH . 'wp-admin/includes/noop.php' );
-require( ABSPATH . WPINC . '/script-loader.php' );
-require( ABSPATH . WPINC . '/version.php' );
+require ABSPATH . 'wp-admin/includes/noop.php';
+require ABSPATH . WPINC . '/script-loader.php';
+require ABSPATH . WPINC . '/version.php';
 
 $protocol = $_SERVER['SERVER_PROTOCOL'];
 if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
diff --git src/wp-admin/maint/repair.php src/wp-admin/maint/repair.php
index 070a91b118..e6bc2418da 100644
--- src/wp-admin/maint/repair.php
+++ src/wp-admin/maint/repair.php
@@ -7,7 +7,7 @@
  */
 define( 'WP_REPAIRING', true );
 
-require_once( dirname( dirname( dirname( __FILE__ ) ) ) . '/wp-load.php' );
+require_once dirname( dirname( __DIR__ ) ) . '/wp-load.php';
 
 header( 'Content-Type: text/html; charset=utf-8' );
 ?>
diff --git src/wp-admin/media-new.php src/wp-admin/media-new.php
index 0cc82a5fd4..c13df43c8f 100644
--- src/wp-admin/media-new.php
+++ src/wp-admin/media-new.php
@@ -10,7 +10,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'upload_files' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to upload files.' ) );
@@ -61,7 +61,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 $form_class = 'media-upload-form type-form validate';
 
@@ -86,4 +86,4 @@ if ( get_user_setting( 'uploader' ) || isset( $_GET['browser-uploader'] ) ) {
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/media-upload.php src/wp-admin/media-upload.php
index 2354cf629d..12ceabf44a 100644
--- src/wp-admin/media-upload.php
+++ src/wp-admin/media-upload.php
@@ -14,7 +14,7 @@ if ( ! isset( $_GET['inline'] ) ) {
 }
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'upload_files' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to upload files.' ), 403 );
diff --git src/wp-admin/media.php src/wp-admin/media.php
index 1e09eda2f8..a1836d2b72 100644
--- src/wp-admin/media.php
+++ src/wp-admin/media.php
@@ -7,7 +7,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $parent_file  = 'upload.php';
 $submenu_file = 'upload.php';
@@ -97,7 +97,7 @@ switch ( $action ) {
 			'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 		);
 
-		require( ABSPATH . 'wp-admin/admin-header.php' );
+		require ABSPATH . 'wp-admin/admin-header.php';
 
 		$parent_file = 'upload.php';
 		$message     = '';
@@ -166,7 +166,7 @@ switch ( $action ) {
 
 		<?php
 
-		require( ABSPATH . 'wp-admin/admin-footer.php' );
+		require ABSPATH . 'wp-admin/admin-footer.php';
 
 		exit;
 
diff --git src/wp-admin/menu.php src/wp-admin/menu.php
index 7aec19663d..50dd4664aa 100644
--- src/wp-admin/menu.php
+++ src/wp-admin/menu.php
@@ -323,4 +323,4 @@ $compat = array(
 	'themes'          => 'appearance',
 );
 
-require_once( ABSPATH . 'wp-admin/includes/menu.php' );
+require_once ABSPATH . 'wp-admin/includes/menu.php';
diff --git src/wp-admin/moderation.php src/wp-admin/moderation.php
index ae375df3e7..f52ff79475 100644
--- src/wp-admin/moderation.php
+++ src/wp-admin/moderation.php
@@ -7,6 +7,6 @@
  * @package WordPress
  * @subpackage Administration
  */
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 wp_redirect( admin_url( 'edit-comments.php?comment_status=moderated' ) );
 exit;
diff --git src/wp-admin/ms-admin.php src/wp-admin/ms-admin.php
index 35e21e971a..24339eca28 100644
--- src/wp-admin/ms-admin.php
+++ src/wp-admin/ms-admin.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url() );
 exit;
diff --git src/wp-admin/ms-delete-site.php src/wp-admin/ms-delete-site.php
index 3cb1574356..bd06703c08 100644
--- src/wp-admin/ms-delete-site.php
+++ src/wp-admin/ms-delete-site.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! is_multisite() ) {
 	wp_die( __( 'Multisite support is not enabled.' ) );
@@ -37,7 +37,7 @@ $user = wp_get_current_user();
 
 $title       = __( 'Delete Site' );
 $parent_file = 'tools.php';
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 echo '<div class="wrap">';
 echo '<h1>' . esc_html( $title ) . '</h1>';
@@ -133,4 +133,4 @@ Webmaster
 }
 echo '</div>';
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/ms-edit.php src/wp-admin/ms-edit.php
index 5c405e6f73..c9503b358d 100644
--- src/wp-admin/ms-edit.php
+++ src/wp-admin/ms-edit.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url() );
 exit;
diff --git src/wp-admin/ms-options.php src/wp-admin/ms-options.php
index 6bf5eb6b1b..ebc8529624 100644
--- src/wp-admin/ms-options.php
+++ src/wp-admin/ms-options.php
@@ -7,6 +7,6 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url( 'settings.php' ) );
diff --git src/wp-admin/ms-sites.php src/wp-admin/ms-sites.php
index 79602cb07f..f1f8fdcb58 100644
--- src/wp-admin/ms-sites.php
+++ src/wp-admin/ms-sites.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url( 'sites.php' ) );
 exit;
diff --git src/wp-admin/ms-themes.php src/wp-admin/ms-themes.php
index 4b86ac9684..f3d8a38352 100644
--- src/wp-admin/ms-themes.php
+++ src/wp-admin/ms-themes.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url( 'themes.php' ) );
 exit;
diff --git src/wp-admin/ms-upgrade-network.php src/wp-admin/ms-upgrade-network.php
index 892ab964c7..25c604631b 100644
--- src/wp-admin/ms-upgrade-network.php
+++ src/wp-admin/ms-upgrade-network.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url( 'upgrade.php' ) );
 exit;
diff --git src/wp-admin/ms-users.php src/wp-admin/ms-users.php
index 1b00514ec3..6771807157 100644
--- src/wp-admin/ms-users.php
+++ src/wp-admin/ms-users.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_redirect( network_admin_url( 'users.php' ) );
 exit;
diff --git src/wp-admin/my-sites.php src/wp-admin/my-sites.php
index a733cf25ed..e2d8699135 100644
--- src/wp-admin/my-sites.php
+++ src/wp-admin/my-sites.php
@@ -7,7 +7,7 @@
  * @since 3.0.0
  */
 
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! is_multisite() ) {
 	wp_die( __( 'Multisite support is not enabled.' ) );
@@ -52,7 +52,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 if ( $updated ) { ?>
 	<div id="message" class="updated notice is-dismissible"><p><strong><?php _e( 'Settings saved.' ); ?></strong></p></div>
@@ -157,4 +157,4 @@ else :
 <?php endif; ?>
 	</div>
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/nav-menus.php src/wp-admin/nav-menus.php
index d707e49cbf..08e2bcf9e2 100644
--- src/wp-admin/nav-menus.php
+++ src/wp-admin/nav-menus.php
@@ -10,10 +10,10 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 // Load all the nav menu interface functions
-require_once( ABSPATH . 'wp-admin/includes/nav-menu.php' );
+require_once ABSPATH . 'wp-admin/includes/nav-menu.php';
 
 if ( ! current_theme_supports( 'menus' ) && ! current_theme_supports( 'widgets' ) ) {
 	wp_die( __( 'Your theme does not support navigation menus or widgets.' ) );
@@ -606,7 +606,7 @@ get_current_screen()->set_help_sidebar(
 );
 
 // Get the admin header.
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap">
 	<h1 class="wp-heading-inline"><?php echo esc_html( __( 'Menus' ) ); ?></h1>
@@ -1035,4 +1035,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 	</div><!-- /#nav-menus-frame -->
 	<?php endif; ?>
 </div><!-- /.wrap-->
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network.php src/wp-admin/network.php
index a3409622a0..a52f07d08b 100644
--- src/wp-admin/network.php
+++ src/wp-admin/network.php
@@ -13,7 +13,7 @@
 define( 'WP_INSTALLING_NETWORK', true );
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'setup_network' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -30,7 +30,7 @@ if ( is_multisite() ) {
 	}
 }
 
-require_once( dirname( __FILE__ ) . '/includes/network.php' );
+require_once __DIR__ . '/includes/network.php';
 
 // We need to create references to ms global tables to enable Network.
 foreach ( $wpdb->tables( 'ms_global' ) as $table => $prefixed_table ) {
@@ -81,7 +81,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap">
 <h1><?php echo esc_html( $title ); ?></h1>
@@ -91,7 +91,7 @@ if ( $_POST ) {
 
 	check_admin_referer( 'install-network-1' );
 
-	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+	require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 	// Create network tables.
 	install_network();
 	$base              = parse_url( trailingslashit( get_option( 'home' ) ), PHP_URL_PATH );
@@ -118,4 +118,4 @@ if ( $_POST ) {
 ?>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network/about.php src/wp-admin/network/about.php
index 829fa1beef..35fde6858f 100644
--- src/wp-admin/network/about.php
+++ src/wp-admin/network/about.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/about.php' );
+require ABSPATH . 'wp-admin/about.php';
diff --git src/wp-admin/network/admin.php src/wp-admin/network/admin.php
index 693fa5aa11..5c2ce2e858 100644
--- src/wp-admin/network/admin.php
+++ src/wp-admin/network/admin.php
@@ -10,7 +10,7 @@
 define( 'WP_NETWORK_ADMIN', true );
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( dirname( __FILE__ ) ) . '/admin.php' );
+require_once dirname( __DIR__ ) . '/admin.php';
 
 // Do not remove this check. It is required by individual network admin pages.
 if ( ! is_multisite() ) {
diff --git src/wp-admin/network/credits.php src/wp-admin/network/credits.php
index 75ee6e7337..6e6a0a9961 100644
--- src/wp-admin/network/credits.php
+++ src/wp-admin/network/credits.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/credits.php' );
+require ABSPATH . 'wp-admin/credits.php';
diff --git src/wp-admin/network/edit.php src/wp-admin/network/edit.php
index 51381e40bf..e33792debf 100644
--- src/wp-admin/network/edit.php
+++ src/wp-admin/network/edit.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $action = ( isset( $_GET['action'] ) ) ? $_GET['action'] : '';
 
diff --git src/wp-admin/network/freedoms.php src/wp-admin/network/freedoms.php
index 9afbe82f34..b6319df607 100644
--- src/wp-admin/network/freedoms.php
+++ src/wp-admin/network/freedoms.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/freedoms.php' );
+require ABSPATH . 'wp-admin/freedoms.php';
diff --git src/wp-admin/network/index.php src/wp-admin/network/index.php
index fbc169bd21..840ae4d473 100644
--- src/wp-admin/network/index.php
+++ src/wp-admin/network/index.php
@@ -8,10 +8,10 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** Load WordPress dashboard API */
-require_once( ABSPATH . 'wp-admin/includes/dashboard.php' );
+require_once ABSPATH . 'wp-admin/includes/dashboard.php';
 
 if ( ! current_user_can( 'manage_network' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
@@ -62,7 +62,7 @@ wp_enqueue_script( 'dashboard' );
 wp_enqueue_script( 'plugin-install' );
 add_thickbox();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -80,4 +80,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 
 <?php
 wp_print_community_events_templates();
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/menu.php src/wp-admin/network/menu.php
index 03a2edf954..28509b1769 100644
--- src/wp-admin/network/menu.php
+++ src/wp-admin/network/menu.php
@@ -115,4 +115,4 @@ unset( $update_data );
 
 $menu[99] = array( '', 'exist', 'separator-last', '', 'wp-menu-separator' );
 
-require_once( ABSPATH . 'wp-admin/includes/menu.php' );
+require_once ABSPATH . 'wp-admin/includes/menu.php';
diff --git src/wp-admin/network/plugin-editor.php src/wp-admin/network/plugin-editor.php
index 7171e7252c..e807caee4a 100644
--- src/wp-admin/network/plugin-editor.php
+++ src/wp-admin/network/plugin-editor.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/plugin-editor.php' );
+require ABSPATH . 'wp-admin/plugin-editor.php';
diff --git src/wp-admin/network/plugin-install.php src/wp-admin/network/plugin-install.php
index f771f63a88..f34ed8346d 100644
--- src/wp-admin/network/plugin-install.php
+++ src/wp-admin/network/plugin-install.php
@@ -12,6 +12,6 @@ if ( isset( $_GET['tab'] ) && ( 'plugin-information' == $_GET['tab'] ) ) {
 }
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/plugin-install.php' );
+require ABSPATH . 'wp-admin/plugin-install.php';
diff --git src/wp-admin/network/plugins.php src/wp-admin/network/plugins.php
index 56c3debd01..21139ada11 100644
--- src/wp-admin/network/plugins.php
+++ src/wp-admin/network/plugins.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/plugins.php' );
+require ABSPATH . 'wp-admin/plugins.php';
diff --git src/wp-admin/network/privacy.php src/wp-admin/network/privacy.php
index 5cba05d37d..57842b7b8a 100644
--- src/wp-admin/network/privacy.php
+++ src/wp-admin/network/privacy.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/privacy.php' );
+require ABSPATH . 'wp-admin/privacy.php';
diff --git src/wp-admin/network/profile.php src/wp-admin/network/profile.php
index 240ef980a4..6a27557292 100644
--- src/wp-admin/network/profile.php
+++ src/wp-admin/network/profile.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/profile.php' );
+require ABSPATH . 'wp-admin/profile.php';
diff --git src/wp-admin/network/settings.php src/wp-admin/network/settings.php
index c100a665f3..f33c7c20cf 100644
--- src/wp-admin/network/settings.php
+++ src/wp-admin/network/settings.php
@@ -8,10 +8,10 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** WordPress Translation Installation API */
-require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 if ( ! current_user_can( 'manage_network_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
@@ -135,7 +135,7 @@ if ( $_POST ) {
 	exit();
 }
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 
 if ( isset( $_GET['updated'] ) ) {
 	?><div id="message" class="updated notice is-dismissible"><p><?php _e( 'Settings saved.' ); ?></p></div>
@@ -486,4 +486,4 @@ if ( isset( $_GET['updated'] ) ) {
 	</form>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network/setup.php src/wp-admin/network/setup.php
index 9a642bbb92..4b1f5b1e59 100644
--- src/wp-admin/network/setup.php
+++ src/wp-admin/network/setup.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/network.php' );
+require ABSPATH . 'wp-admin/network.php';
diff --git src/wp-admin/network/site-info.php src/wp-admin/network/site-info.php
index 2bcc1c58a3..f224031502 100644
--- src/wp-admin/network/site-info.php
+++ src/wp-admin/network/site-info.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to edit this site.' ) );
@@ -127,7 +127,7 @@ $title = sprintf( __( 'Edit Site: %s' ), esc_html( $details->blogname ) );
 $parent_file  = 'sites.php';
 $submenu_file = 'sites.php';
 
-require( ABSPATH . 'wp-admin/admin-header.php' );
+require ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -206,4 +206,4 @@ if ( ! empty( $messages ) ) {
 
 </div>
 <?php
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/site-new.php src/wp-admin/network/site-new.php
index d86058e0f4..e0b742b9f4 100644
--- src/wp-admin/network/site-new.php
+++ src/wp-admin/network/site-new.php
@@ -8,10 +8,10 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** WordPress Translation Installation API */
-require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 if ( ! current_user_can( 'create_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to add sites to this network.' ) );
@@ -202,7 +202,7 @@ $parent_file = 'sites.php';
 
 wp_enqueue_script( 'user-suggest' );
 
-require( ABSPATH . 'wp-admin/admin-header.php' );
+require ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -300,4 +300,4 @@ printf(
 	</form>
 </div>
 <?php
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/site-settings.php src/wp-admin/network/site-settings.php
index 7c3cae7200..4700aa78d3 100644
--- src/wp-admin/network/site-settings.php
+++ src/wp-admin/network/site-settings.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to edit this site.' ) );
@@ -85,7 +85,7 @@ $title = sprintf( __( 'Edit Site: %s' ), esc_html( $details->blogname ) );
 $parent_file  = 'sites.php';
 $submenu_file = 'sites.php';
 
-require( ABSPATH . 'wp-admin/admin-header.php' );
+require ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -173,4 +173,4 @@ if ( ! empty( $messages ) ) {
 
 </div>
 <?php
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/site-themes.php src/wp-admin/network/site-themes.php
index fc1a79805f..fdd6a29b95 100644
--- src/wp-admin/network/site-themes.php
+++ src/wp-admin/network/site-themes.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage themes for this site.' ) );
@@ -172,7 +172,7 @@ $title = sprintf( __( 'Edit Site: %s' ), esc_html( $details->blogname ) );
 $parent_file  = 'sites.php';
 $submenu_file = 'sites.php';
 
-require( ABSPATH . 'wp-admin/admin-header.php' ); ?>
+require ABSPATH . 'wp-admin/admin-header.php'; ?>
 
 <div class="wrap">
 <h1 id="edit-site"><?php echo $title; ?></h1>
@@ -226,4 +226,4 @@ if ( isset( $_GET['enabled'] ) ) {
 </form>
 
 </div>
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network/site-users.php src/wp-admin/network/site-users.php
index 5113025776..6bfc4b170d 100644
--- src/wp-admin/network/site-users.php
+++ src/wp-admin/network/site-users.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to edit this site.' ), 403 );
@@ -214,7 +214,7 @@ if ( ! wp_is_large_network( 'users' ) && apply_filters( 'show_network_site_users
 	wp_enqueue_script( 'user-suggest' );
 }
 
-require( ABSPATH . 'wp-admin/admin-header.php' ); ?>
+require ABSPATH . 'wp-admin/admin-header.php'; ?>
 
 <script type="text/javascript">
 var current_site_id = <?php echo $id; ?>;
@@ -363,4 +363,4 @@ if ( current_user_can( 'create_users' ) && apply_filters( 'show_network_site_use
 <?php endif; ?>
 </div>
 <?php
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/sites.php src/wp-admin/network/sites.php
index 554e260509..a4a7a2beb3 100644
--- src/wp-admin/network/sites.php
+++ src/wp-admin/network/sites.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_sites' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
@@ -108,7 +108,7 @@ if ( isset( $_GET['action'] ) ) {
 		$site_details = get_site( $id );
 		$site_address = untrailingslashit( $site_details->domain . $site_details->path );
 
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 		?>
 			<div class="wrap">
 				<h1><?php _e( 'Confirm your action' ); ?></h1>
@@ -122,7 +122,7 @@ if ( isset( $_GET['action'] ) ) {
 				</form>
 			</div>
 		<?php
-		require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+		require_once ABSPATH . 'wp-admin/admin-footer.php';
 		exit();
 	} elseif ( array_key_exists( $_GET['action'], $manage_actions ) ) {
 		$action = $_GET['action'];
@@ -184,7 +184,7 @@ if ( isset( $_GET['action'] ) ) {
 					if ( $val != '0' && $val != get_network()->site_id ) {
 						switch ( $doaction ) {
 							case 'delete':
-								require_once( ABSPATH . 'wp-admin/admin-header.php' );
+								require_once ABSPATH . 'wp-admin/admin-header.php';
 								?>
 								<div class="wrap">
 									<h1><?php _e( 'Confirm your action' ); ?></h1>
@@ -209,7 +209,7 @@ if ( isset( $_GET['action'] ) ) {
 									</form>
 								</div>
 								<?php
-								require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+								require_once ABSPATH . 'wp-admin/admin-footer.php';
 								exit();
 							break;
 
@@ -354,7 +354,7 @@ if ( isset( $_GET['updated'] ) ) {
 
 $wp_list_table->prepare_items();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -388,4 +388,4 @@ if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {
 </div>
 <?php
 
-require_once( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+require_once ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network/theme-editor.php src/wp-admin/network/theme-editor.php
index c28c9675cc..e503efa9d5 100644
--- src/wp-admin/network/theme-editor.php
+++ src/wp-admin/network/theme-editor.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/theme-editor.php' );
+require ABSPATH . 'wp-admin/theme-editor.php';
diff --git src/wp-admin/network/theme-install.php src/wp-admin/network/theme-install.php
index 486c74780b..93695d5a8a 100644
--- src/wp-admin/network/theme-install.php
+++ src/wp-admin/network/theme-install.php
@@ -12,6 +12,6 @@ if ( isset( $_GET['tab'] ) && ( 'theme-information' == $_GET['tab'] ) ) {
 }
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/theme-install.php' );
+require ABSPATH . 'wp-admin/theme-install.php';
diff --git src/wp-admin/network/themes.php src/wp-admin/network/themes.php
index f7711f034d..92c9675273 100644
--- src/wp-admin/network/themes.php
+++ src/wp-admin/network/themes.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_network_themes' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage network themes.' ) );
@@ -76,7 +76,7 @@ if ( $action ) {
 			$title       = __( 'Update Themes' );
 			$parent_file = 'themes.php';
 
-			require_once( ABSPATH . 'wp-admin/admin-header.php' );
+			require_once ABSPATH . 'wp-admin/admin-header.php';
 
 			echo '<div class="wrap">';
 			echo '<h1>' . esc_html( $title ) . '</h1>';
@@ -86,7 +86,7 @@ if ( $action ) {
 
 			echo "<iframe src='$url' style='width: 100%; height:100%; min-height:850px;'></iframe>";
 			echo '</div>';
-			require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+			require_once ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 		case 'delete-selected':
 			if ( ! current_user_can( 'delete_themes' ) ) {
@@ -114,13 +114,13 @@ if ( $action ) {
 				$theme_info[ $theme ] = wp_get_theme( $theme );
 			}
 
-			include( ABSPATH . 'wp-admin/update.php' );
+			include ABSPATH . 'wp-admin/update.php';
 
 			$parent_file = 'themes.php';
 
 			if ( ! isset( $_REQUEST['verify-delete'] ) ) {
 				wp_enqueue_script( 'jquery' );
-				require_once( ABSPATH . 'wp-admin/admin-header.php' );
+				require_once ABSPATH . 'wp-admin/admin-header.php';
 				$themes_to_delete = count( $themes );
 				?>
 			<div class="wrap">
@@ -175,7 +175,7 @@ if ( $action ) {
 				</form>
 			</div>
 				<?php
-				require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+				require_once ABSPATH . 'wp-admin/admin-footer.php';
 				exit;
 			} // Endif verify-delete
 
@@ -261,7 +261,7 @@ $parent_file = 'themes.php';
 wp_enqueue_script( 'updates' );
 wp_enqueue_script( 'theme-preview' );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -343,4 +343,4 @@ wp_print_request_filesystem_credentials_modal();
 wp_print_admin_notice_templates();
 wp_print_update_row_templates();
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/update-core.php src/wp-admin/network/update-core.php
index 55f2aca32a..1997b36ed5 100644
--- src/wp-admin/network/update-core.php
+++ src/wp-admin/network/update-core.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/update-core.php' );
+require ABSPATH . 'wp-admin/update-core.php';
diff --git src/wp-admin/network/update.php src/wp-admin/network/update.php
index 62dc7a96e7..2a8bccc709 100644
--- src/wp-admin/network/update.php
+++ src/wp-admin/network/update.php
@@ -12,6 +12,6 @@ if ( isset( $_GET['action'] ) && in_array( $_GET['action'], array( 'update-selec
 }
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/update.php' );
+require ABSPATH . 'wp-admin/update.php';
diff --git src/wp-admin/network/upgrade.php src/wp-admin/network/upgrade.php
index e594a17555..307b8c1806 100644
--- src/wp-admin/network/upgrade.php
+++ src/wp-admin/network/upgrade.php
@@ -8,9 +8,9 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require_once( ABSPATH . WPINC . '/http.php' );
+require_once ABSPATH . WPINC . '/http.php';
 
 $title       = __( 'Upgrade Network' );
 $parent_file = 'upgrade.php';
@@ -32,7 +32,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 if ( ! current_user_can( 'upgrade_network' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
@@ -152,4 +152,4 @@ switch ( $action ) {
 ?>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/network/user-edit.php src/wp-admin/network/user-edit.php
index ef3c2720f1..7b908fd8b6 100644
--- src/wp-admin/network/user-edit.php
+++ src/wp-admin/network/user-edit.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/user-edit.php' );
+require ABSPATH . 'wp-admin/user-edit.php';
diff --git src/wp-admin/network/user-new.php src/wp-admin/network/user-new.php
index 2bb2de1ed7..61f108701c 100644
--- src/wp-admin/network/user-new.php
+++ src/wp-admin/network/user-new.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'create_users' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to add users to this network.' ) );
@@ -99,7 +99,7 @@ if ( isset( $_GET['update'] ) ) {
 $title       = __( 'Add New User' );
 $parent_file = 'users.php';
 
-require( ABSPATH . 'wp-admin/admin-header.php' ); ?>
+require ABSPATH . 'wp-admin/admin-header.php'; ?>
 
 <div class="wrap">
 <h1 id="add-new-user"><?php _e( 'Add New User' ); ?></h1>
@@ -148,4 +148,4 @@ if ( isset( $add_user_errors ) && is_wp_error( $add_user_errors ) ) {
 	</form>
 </div>
 <?php
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/network/users.php src/wp-admin/network/users.php
index 9c5bcc0ca4..3cb2d3bf39 100644
--- src/wp-admin/network/users.php
+++ src/wp-admin/network/users.php
@@ -8,7 +8,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_network_users' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
@@ -31,11 +31,11 @@ if ( isset( $_GET['action'] ) ) {
 				$_POST['allusers'] = array( $id ); // confirm_delete_users() can only handle with arrays
 				$title             = __( 'Users' );
 				$parent_file       = 'users.php';
-				require_once( ABSPATH . 'wp-admin/admin-header.php' );
+				require_once ABSPATH . 'wp-admin/admin-header.php';
 				echo '<div class="wrap">';
 				confirm_delete_users( $_POST['allusers'] );
 				echo '</div>';
-				require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+				require_once ABSPATH . 'wp-admin/admin-footer.php';
 			} else {
 				wp_redirect( network_admin_url( 'users.php' ) );
 			}
@@ -61,11 +61,11 @@ if ( isset( $_GET['action'] ) ) {
 								}
 								$title       = __( 'Users' );
 								$parent_file = 'users.php';
-								require_once( ABSPATH . 'wp-admin/admin-header.php' );
+								require_once ABSPATH . 'wp-admin/admin-header.php';
 								echo '<div class="wrap">';
 								confirm_delete_users( $_POST['allusers'] );
 								echo '</div>';
-								require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+								require_once ABSPATH . 'wp-admin/admin-footer.php';
 								exit();
 
 							case 'spam':
@@ -237,7 +237,7 @@ get_current_screen()->set_screen_reader_content(
 	)
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 if ( isset( $_REQUEST['updated'] ) && $_REQUEST['updated'] == 'true' && ! empty( $_REQUEST['action'] ) ) {
 	?>
@@ -294,4 +294,4 @@ if ( isset( $_REQUEST['updated'] ) && $_REQUEST['updated'] == 'true' && ! empty(
 	</form>
 </div>
 
-<?php require_once( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php require_once ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-discussion.php src/wp-admin/options-discussion.php
index a61a5f6f8e..5c5aaf7536 100644
--- src/wp-admin/options-discussion.php
+++ src/wp-admin/options-discussion.php
@@ -6,7 +6,7 @@
  * @subpackage Administration
  */
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -32,7 +32,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -328,4 +328,4 @@ echo apply_filters( 'default_avatar_select', $avatar_list );
 </form>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-general.php src/wp-admin/options-general.php
index 13aa9c8114..8682189327 100644
--- src/wp-admin/options-general.php
+++ src/wp-admin/options-general.php
@@ -7,10 +7,10 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** WordPress Translation Installation API */
-require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -49,7 +49,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -405,4 +405,4 @@ endfor;
 
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-media.php src/wp-admin/options-media.php
index 4cc5e4c5ef..76c89265ac 100644
--- src/wp-admin/options-media.php
+++ src/wp-admin/options-media.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -38,7 +38,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -153,4 +153,4 @@ if ( isset( $GLOBALS['wp_settings']['media']['embeds'] ) ) :
 
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-permalink.php src/wp-admin/options-permalink.php
index b9a69678ff..b20bb98ac5 100644
--- src/wp-admin/options-permalink.php
+++ src/wp-admin/options-permalink.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -183,7 +183,7 @@ if ( isset( $_POST['permalink_structure'] ) || isset( $_POST['category_base'] )
 
 flush_rewrite_rules();
 
-require( ABSPATH . 'wp-admin/admin-header.php' );
+require ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap">
 <h1><?php echo esc_html( $title ); ?></h1>
@@ -423,4 +423,4 @@ else :
 
 </div>
 
-<?php require( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php require ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-privacy.php src/wp-admin/options-privacy.php
index 95492b326f..6d531b5aa8 100644
--- src/wp-admin/options-privacy.php
+++ src/wp-admin/options-privacy.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_privacy_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage privacy on this site.' ) );
@@ -49,7 +49,7 @@ if ( ! empty( $action ) ) {
 	} elseif ( 'create-privacy-page' === $action ) {
 
 		if ( ! class_exists( 'WP_Privacy_Policy_Content' ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php';
 		}
 
 		$privacy_policy_page_content = WP_Privacy_Policy_Content::get_default_content();
@@ -115,7 +115,7 @@ if ( ! empty( $privacy_policy_page_id ) ) {
 $title       = __( 'Privacy Settings' );
 $parent_file = 'options-general.php';
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 <div class="wrap">
@@ -252,4 +252,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </div>
 <?php
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/options-reading.php src/wp-admin/options-reading.php
index 662954ea24..dfe3742e97 100644
--- src/wp-admin/options-reading.php
+++ src/wp-admin/options-reading.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -52,7 +52,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -215,4 +215,4 @@ else :
 <?php submit_button(); ?>
 </form>
 </div>
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options-writing.php src/wp-admin/options-writing.php
index 1ea19cd129..581ce08563 100644
--- src/wp-admin/options-writing.php
+++ src/wp-admin/options-writing.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage options for this site.' ) );
@@ -53,7 +53,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -236,4 +236,4 @@ if ( apply_filters( 'enable_update_services_configuration', true ) ) {
 </form>
 </div>
 
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/options.php src/wp-admin/options.php
index 1aaad130b4..1ff1aadd3b 100644
--- src/wp-admin/options.php
+++ src/wp-admin/options.php
@@ -16,7 +16,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $title       = __( 'Settings' );
 $this_file   = 'options.php';
@@ -246,7 +246,7 @@ if ( 'update' == $action ) {
 
 		// Handle translation installation.
 		if ( ! empty( $_POST['WPLANG'] ) && current_user_can( 'install_languages' ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+			require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 			if ( wp_can_install_language_pack() ) {
 				$language = wp_download_language_pack( $_POST['WPLANG'] );
@@ -314,7 +314,7 @@ if ( 'update' == $action ) {
 	exit;
 }
 
-include( ABSPATH . 'wp-admin/admin-header.php' ); ?>
+include ABSPATH . 'wp-admin/admin-header.php'; ?>
 
 <div class="wrap">
 	<h1><?php esc_html_e( 'All Settings' ); ?></h1>
@@ -374,4 +374,4 @@ foreach ( (array) $options as $option ) :
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/plugin-editor.php src/wp-admin/plugin-editor.php
index 0b44fbb499..e617b44240 100644
--- src/wp-admin/plugin-editor.php
+++ src/wp-admin/plugin-editor.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( is_multisite() && ! is_network_admin() ) {
 	wp_redirect( network_admin_url( 'plugin-editor.php' ) );
@@ -24,14 +24,14 @@ $parent_file = 'plugins.php';
 $plugins = get_plugins();
 
 if ( empty( $plugins ) ) {
-	include( ABSPATH . 'wp-admin/admin-header.php' );
+	include ABSPATH . 'wp-admin/admin-header.php';
 	?>
 	<div class="wrap">
 		<h1><?php echo esc_html( $title ); ?></h1>
 		<div id="message" class="error"><p><?php _e( 'You do not appear to have any plugins available at this time.' ); ?></p></div>
 	</div>
 	<?php
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 	exit;
 }
 
@@ -150,7 +150,7 @@ if ( ! is_file( $real_file ) ) {
 	wp_add_inline_script( 'wp-theme-plugin-editor', sprintf( 'jQuery( function( $ ) { wp.themePluginEditor.init( $( "#template" ), %s ); } )', wp_json_encode( $settings ) ) );
 	wp_add_inline_script( 'wp-theme-plugin-editor', sprintf( 'wp.themePluginEditor.themeOrPlugin = "plugin";' ) );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 
 	update_recently_edited( WP_PLUGIN_DIR . '/' . $file );
 
@@ -326,4 +326,4 @@ if ( ! in_array( 'plugin_editor_notice', $dismissed_pointers, true ) ) :
 	<?php
 endif; // Editor warning notice.
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/plugin-install.php src/wp-admin/plugin-install.php
index 52dd791684..2780426c70 100644
--- src/wp-admin/plugin-install.php
+++ src/wp-admin/plugin-install.php
@@ -13,7 +13,7 @@ if ( ! defined( 'IFRAME_REQUEST' ) && isset( $_GET['tab'] ) && ( 'plugin-informa
 /**
  * WordPress Administration Bootstrap.
  */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'install_plugins' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to install plugins on this site.' ) );
@@ -121,7 +121,7 @@ get_current_screen()->set_screen_reader_content(
 /**
  * WordPress Administration Template Header.
  */
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap <?php echo esc_attr( "plugin-install-tab-$tab" ); ?>">
 <h1 class="wp-heading-inline">
@@ -184,4 +184,4 @@ wp_print_admin_notice_templates();
 /**
  * WordPress Administration Template Footer.
  */
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/plugins.php src/wp-admin/plugins.php
index 459a2f82f6..afce3c4357 100644
--- src/wp-admin/plugins.php
+++ src/wp-admin/plugins.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'activate_plugins' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage plugins for this site.' ) );
@@ -141,7 +141,7 @@ if ( $action ) {
 			$parent_file = 'plugins.php';
 
 			wp_enqueue_script( 'updates' );
-			require_once( ABSPATH . 'wp-admin/admin-header.php' );
+			require_once ABSPATH . 'wp-admin/admin-header.php';
 
 			echo '<div class="wrap">';
 			echo '<h1>' . esc_html( $title ) . '</h1>';
@@ -151,7 +151,7 @@ if ( $action ) {
 
 			echo "<iframe src='$url' style='width: 100%; height:100%; min-height:850px;'></iframe>";
 			echo '</div>';
-			require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+			require_once ABSPATH . 'wp-admin/admin-footer.php';
 			exit;
 
 		case 'error_scrape':
@@ -275,13 +275,13 @@ if ( $action ) {
 				exit;
 			}
 
-			include( ABSPATH . 'wp-admin/update.php' );
+			include ABSPATH . 'wp-admin/update.php';
 
 			$parent_file = 'plugins.php';
 
 			if ( ! isset( $_REQUEST['verify-delete'] ) ) {
 				wp_enqueue_script( 'jquery' );
-				require_once( ABSPATH . 'wp-admin/admin-header.php' );
+				require_once ABSPATH . 'wp-admin/admin-header.php';
 				?>
 			<div class="wrap">
 				<?php
@@ -371,7 +371,7 @@ if ( $action ) {
 				</form>
 			</div>
 				<?php
-				require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+				require_once ABSPATH . 'wp-admin/admin-footer.php';
 				exit;
 			} else {
 				$plugins_to_delete = count( $plugins );
@@ -480,7 +480,7 @@ get_current_screen()->set_screen_reader_content(
 $title       = __( 'Plugins' );
 $parent_file = 'plugins.php';
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 $invalid = validate_active_plugins();
 if ( ! empty( $invalid ) ) {
@@ -642,4 +642,4 @@ wp_print_request_filesystem_credentials_modal();
 wp_print_admin_notice_templates();
 wp_print_update_row_templates();
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/post-new.php src/wp-admin/post-new.php
index a93a11bffe..0f6992e809 100644
--- src/wp-admin/post-new.php
+++ src/wp-admin/post-new.php
@@ -7,7 +7,7 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /**
  * @global string  $post_type
@@ -69,10 +69,10 @@ $post_ID = $post->ID;
 /** This filter is documented in wp-admin/post.php */
 if ( apply_filters( 'replace_editor', false, $post ) !== true ) {
 	if ( use_block_editor_for_post( $post ) ) {
-		include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
+		include ABSPATH . 'wp-admin/edit-form-blocks.php';
 	} else {
 		wp_enqueue_script( 'autosave' );
-		include( ABSPATH . 'wp-admin/edit-form-advanced.php' );
+		include ABSPATH . 'wp-admin/edit-form-advanced.php';
 	}
 } else {
 	// Flag that we're not loading the block editor.
@@ -80,4 +80,4 @@ if ( apply_filters( 'replace_editor', false, $post ) !== true ) {
 	$current_screen->is_block_editor( false );
 }
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/post.php src/wp-admin/post.php
index ef3e73a829..02268cb0c7 100644
--- src/wp-admin/post.php
+++ src/wp-admin/post.php
@@ -9,7 +9,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $parent_file  = 'edit.php';
 $submenu_file = 'edit.php';
@@ -176,7 +176,7 @@ switch ( $action ) {
 		}
 
 		if ( use_block_editor_for_post( $post ) ) {
-			include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
+			include ABSPATH . 'wp-admin/edit-form-blocks.php';
 			break;
 		}
 
@@ -195,7 +195,7 @@ switch ( $action ) {
 			enqueue_comment_hotkeys_js();
 		}
 
-		include( ABSPATH . 'wp-admin/edit-form-advanced.php' );
+		include ABSPATH . 'wp-admin/edit-form-advanced.php';
 
 		break;
 
@@ -350,4 +350,4 @@ switch ( $action ) {
 		wp_redirect( admin_url( 'edit.php' ) );
 		exit();
 } // end switch
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/press-this.php src/wp-admin/press-this.php
index 0f00dee40b..ebe7502f54 100644
--- src/wp-admin/press-this.php
+++ src/wp-admin/press-this.php
@@ -9,7 +9,7 @@
 define( 'IFRAME_REQUEST', true );
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 function wp_load_press_this() {
 	$plugin_slug = 'press-this';
@@ -22,7 +22,7 @@ function wp_load_press_this() {
 			403
 		);
 	} elseif ( is_plugin_active( $plugin_file ) ) {
-		include( WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php' );
+		include WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php';
 		$wp_press_this = new WP_Press_This_Plugin();
 		$wp_press_this->html();
 	} elseif ( current_user_can( 'activate_plugins' ) ) {
diff --git src/wp-admin/privacy-policy-guide.php src/wp-admin/privacy-policy-guide.php
index f3d8703f88..98cebbd99c 100644
--- src/wp-admin/privacy-policy-guide.php
+++ src/wp-admin/privacy-policy-guide.php
@@ -7,21 +7,21 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'manage_privacy_options' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to manage privacy on this site.' ) );
 }
 
 if ( ! class_exists( 'WP_Privacy_Policy_Content' ) ) {
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-privacy-policy-content.php';
 }
 
 $title = __( 'Privacy Policy Guide' );
 
 wp_enqueue_script( 'privacy-tools' );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 <div class="wrap">
@@ -33,4 +33,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </div>
 <?php
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/privacy.php src/wp-admin/privacy.php
index 25dc75e00b..f407962da3 100644
--- src/wp-admin/privacy.php
+++ src/wp-admin/privacy.php
@@ -7,13 +7,13 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $title = __( 'Privacy' );
 
 list( $display_version ) = explode( '-', get_bloginfo( 'version' ) );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="wrap about__container">
 
@@ -76,4 +76,4 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 	</div>
 
 </div>
-<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
+<?php include ABSPATH . 'wp-admin/admin-footer.php'; ?>
diff --git src/wp-admin/profile.php src/wp-admin/profile.php
index 577925aba7..18fb60069b 100644
--- src/wp-admin/profile.php
+++ src/wp-admin/profile.php
@@ -15,4 +15,4 @@
 define( 'IS_PROFILE_PAGE', true );
 
 /** Load User Editing Page */
-require_once( dirname( __FILE__ ) . '/user-edit.php' );
+require_once __DIR__ . '/user-edit.php';
diff --git src/wp-admin/revision.php src/wp-admin/revision.php
index 2d435a6c34..55cbd9363f 100644
--- src/wp-admin/revision.php
+++ src/wp-admin/revision.php
@@ -10,7 +10,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 require ABSPATH . 'wp-admin/includes/revision.php';
 
@@ -147,7 +147,7 @@ $revisions_sidebar .= '<p>' . __( '<a href="https://wordpress.org/support/">Supp
 
 get_current_screen()->set_help_sidebar( $revisions_sidebar );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 
@@ -158,4 +158,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 <?php
 wp_print_revision_templates();
 
-require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+require_once ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/setup-config.php src/wp-admin/setup-config.php
index f9be50f05a..dec1733d5b 100644
--- src/wp-admin/setup-config.php
+++ src/wp-admin/setup-config.php
@@ -27,16 +27,16 @@ define( 'WP_SETUP_CONFIG', true );
 error_reporting( 0 );
 
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
+	define( 'ABSPATH', dirname( __DIR__ ) . '/' );
 }
 
-require( ABSPATH . 'wp-settings.php' );
+require ABSPATH . 'wp-settings.php';
 
 /** Load WordPress Administration Upgrade API */
-require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 /** Load WordPress Translation Installation API */
-require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 
 nocache_headers();
 
diff --git src/wp-admin/site-health-info.php src/wp-admin/site-health-info.php
index 34471a0968..2923d36741 100644
--- src/wp-admin/site-health-info.php
+++ src/wp-admin/site-health-info.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $title = __( 'Site Health Info' );
 
@@ -19,15 +19,15 @@ wp_enqueue_style( 'site-health' );
 wp_enqueue_script( 'site-health' );
 
 if ( ! class_exists( 'WP_Debug_Data' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-debug-data.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-debug-data.php';
 }
 if ( ! class_exists( 'WP_Site_Health' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 }
 
 $health_check_site_status = new WP_Site_Health();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="health-check-header">
 	<div class="health-check-title-section">
@@ -181,4 +181,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/site-health.php src/wp-admin/site-health.php
index 52ff845289..555962fc1b 100644
--- src/wp-admin/site-health.php
+++ src/wp-admin/site-health.php
@@ -7,12 +7,12 @@
  */
 
 if ( isset( $_GET['tab'] ) && 'debug' === $_GET['tab'] ) {
-	require_once( dirname( __FILE__ ) . '/site-health-info.php' );
+	require_once __DIR__ . '/site-health-info.php';
 	return;
 }
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 $title = __( 'Site Health Status' );
 
@@ -24,7 +24,7 @@ wp_enqueue_style( 'site-health' );
 wp_enqueue_script( 'site-health' );
 
 if ( ! class_exists( 'WP_Site_Health' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 }
 
 $health_check_site_status = new WP_Site_Health();
@@ -32,7 +32,7 @@ $health_check_site_status = new WP_Site_Health();
 // Start by checking if this is a special request checking for the existence of certain filters.
 $health_check_site_status->check_wp_version_check_exists();
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 <div class="health-check-header">
 	<div class="health-check-title-section">
@@ -157,4 +157,4 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 </script>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/term.php src/wp-admin/term.php
index fd7d276bb3..68523f1271 100644
--- src/wp-admin/term.php
+++ src/wp-admin/term.php
@@ -8,7 +8,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( empty( $_REQUEST['tag_ID'] ) ) {
 	$sendback = admin_url( 'edit-tags.php' );
@@ -70,6 +70,6 @@ get_current_screen()->set_screen_reader_content(
 	)
 );
 wp_enqueue_script( 'admin-tags' );
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
-include( ABSPATH . 'wp-admin/edit-tag-form.php' );
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
+include ABSPATH . 'wp-admin/edit-tag-form.php';
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/theme-editor.php src/wp-admin/theme-editor.php
index c958353e1f..038eacec0d 100644
--- src/wp-admin/theme-editor.php
+++ src/wp-admin/theme-editor.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( is_multisite() && ! is_network_admin() ) {
 	wp_redirect( network_admin_url( 'theme-editor.php' ) );
@@ -146,7 +146,7 @@ if ( 'POST' === $_SERVER['REQUEST_METHOD'] ) {
 	wp_add_inline_script( 'wp-theme-plugin-editor', sprintf( 'jQuery( function( $ ) { wp.themePluginEditor.init( $( "#template" ), %s ); } )', wp_json_encode( $settings ) ) );
 	wp_add_inline_script( 'wp-theme-plugin-editor', 'wp.themePluginEditor.themeOrPlugin = "theme";' );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 
 	update_recently_edited( $file );
 
@@ -378,4 +378,4 @@ if ( ! in_array( 'theme_editor_notice', $dismissed_pointers, true ) ) :
 	<?php
 endif; // editor warning notice
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/theme-install.php src/wp-admin/theme-install.php
index b77e85054a..e7f271df68 100644
--- src/wp-admin/theme-install.php
+++ src/wp-admin/theme-install.php
@@ -7,8 +7,8 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
-require( ABSPATH . 'wp-admin/includes/theme-install.php' );
+require_once __DIR__ . '/admin.php';
+require ABSPATH . 'wp-admin/includes/theme-install.php';
 
 wp_reset_vars( array( 'tab' ) );
 
@@ -131,7 +131,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-include( ABSPATH . 'wp-admin/admin-header.php' );
+include ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 <div class="wrap">
@@ -372,4 +372,4 @@ if ( $tab ) {
 wp_print_request_filesystem_credentials_modal();
 wp_print_admin_notice_templates();
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/themes.php src/wp-admin/themes.php
index 244f573ce6..dbf055881e 100644
--- src/wp-admin/themes.php
+++ src/wp-admin/themes.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'switch_themes' ) && ! current_user_can( 'edit_theme_options' ) ) {
 	wp_die(
@@ -182,7 +182,7 @@ add_thickbox();
 wp_enqueue_script( 'theme' );
 wp_enqueue_script( 'updates' );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -622,4 +622,4 @@ wp_localize_script(
 	)
 );
 
-require( ABSPATH . 'wp-admin/admin-footer.php' );
+require ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/tools.php src/wp-admin/tools.php
index 447d6738ac..6ea85ca459 100644
--- src/wp-admin/tools.php
+++ src/wp-admin/tools.php
@@ -10,16 +10,16 @@ if ( isset( $_GET['page'] ) && ! empty( $_POST ) ) {
 	// Ensure POST-ing to `tools.php?page=export_personal_data` and `tools.php?page=remove_personal_data`
 	// continues to work after creating the new files for exporting and erasing of personal data.
 	if ( $_GET['page'] === 'export_personal_data' ) {
-		require_once( ABSPATH . 'wp-admin/export-personal-data.php' );
+		require_once ABSPATH . 'wp-admin/export-personal-data.php';
 		return;
 	} elseif ( $_GET['page'] === 'remove_personal_data' ) {
-		require_once( ABSPATH . 'wp-admin/erase-personal-data.php' );
+		require_once ABSPATH . 'wp-admin/erase-personal-data.php';
 		return;
 	}
 }
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 // The privacy policy guide used to be outputted from here. Since WP 5.3 it is in wp-admin/privacy-policy-guide.php.
 if ( isset( $_GET['wp-privacy-policy-guide'] ) ) {
@@ -53,7 +53,7 @@ get_current_screen()->set_help_sidebar(
 	'<p>' . __( '<a href="https://wordpress.org/support/">Support</a>' ) . '</p>'
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 ?>
 <div class="wrap">
@@ -92,4 +92,4 @@ do_action( 'tool_box' );
 </div>
 <?php
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/update-core.php src/wp-admin/update-core.php
index 2093201149..951d93d7aa 100644
--- src/wp-admin/update-core.php
+++ src/wp-admin/update-core.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_enqueue_style( 'plugin-install' );
 wp_enqueue_script( 'plugin-install' );
@@ -297,7 +297,7 @@ function list_plugin_updates() {
 	$wp_version     = get_bloginfo( 'version' );
 	$cur_wp_version = preg_replace( '/-.*$/', '', $wp_version );
 
-	require_once( ABSPATH . 'wp-admin/includes/plugin-install.php' );
+	require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
 	$plugins = get_plugin_updates();
 	if ( empty( $plugins ) ) {
 		echo '<h2>' . __( 'Plugins' ) . '</h2>';
@@ -559,7 +559,7 @@ function list_translation_updates() {
 function do_core_upgrade( $reinstall = false ) {
 	global $wp_filesystem;
 
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	if ( $reinstall ) {
 		$url = 'update-core.php?action=do-core-reinstall';
@@ -736,7 +736,7 @@ if ( 'upgrade-core' == $action ) {
 	$force_check = ! empty( $_GET['force-check'] );
 	wp_version_check( array(), $force_check );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 	?>
 	<div class="wrap">
 	<h1><?php _e( 'WordPress Updates' ); ?></h1>
@@ -793,7 +793,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) {
 
@@ -810,7 +810,7 @@ if ( 'upgrade-core' == $action ) {
 		do_undismiss_core_update();
 	}
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 	if ( 'do-core-reinstall' == $action ) {
 		$reinstall = true;
 	} else {
@@ -829,7 +829,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-plugin-upgrade' == $action ) {
 
@@ -853,7 +853,7 @@ if ( 'upgrade-core' == $action ) {
 
 	$title = __( 'Update Plugins' );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 	echo '<div class="wrap">';
 	echo '<h1>' . __( 'Update Plugins' ) . '</h1>';
 	echo '<iframe src="', $url, '" style="width: 100%; height: 100%; min-height: 750px;" frameborder="0" title="' . esc_attr__( 'Update progress' ) . '"></iframe>';
@@ -867,7 +867,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-theme-upgrade' == $action ) {
 
@@ -891,7 +891,7 @@ if ( 'upgrade-core' == $action ) {
 
 	$title = __( 'Update Themes' );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 	?>
 	<div class="wrap">
 		<h1><?php _e( 'Update Themes' ); ?></h1>
@@ -907,7 +907,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-translation-upgrade' == $action ) {
 
@@ -917,8 +917,8 @@ if ( 'upgrade-core' == $action ) {
 
 	check_admin_referer( 'upgrade-translations' );
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	$url     = 'update-core.php?action=do-translation-upgrade';
 	$nonce   = 'upgrade-translations';
@@ -936,7 +936,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+	require_once ABSPATH . 'wp-admin/admin-footer.php';
 
 } else {
 	/**
diff --git src/wp-admin/update.php src/wp-admin/update.php
index 5a70aa87d9..18313a4b90 100644
--- src/wp-admin/update.php
+++ src/wp-admin/update.php
@@ -11,9 +11,9 @@ if ( ! defined( 'IFRAME_REQUEST' ) && isset( $_GET['action'] ) && in_array( $_GE
 }
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 if ( isset( $_GET['action'] ) ) {
 	$plugin = isset( $_REQUEST['plugin'] ) ? trim( $_REQUEST['plugin'] ) : '';
@@ -60,7 +60,7 @@ if ( isset( $_GET['action'] ) ) {
 		$submenu_file = 'plugins.php';
 
 		wp_enqueue_script( 'updates' );
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		$nonce = 'upgrade-plugin_' . $plugin;
 		$url   = 'update.php?action=upgrade-plugin&plugin=' . urlencode( $plugin );
@@ -68,7 +68,7 @@ if ( isset( $_GET['action'] ) ) {
 		$upgrader = new Plugin_Upgrader( new Plugin_Upgrader_Skin( compact( 'title', 'nonce', 'url', 'plugin' ) ) );
 		$upgrader->upgrade( $plugin );
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 
 	} elseif ( 'activate-plugin' == $action ) {
 		if ( ! current_user_can( 'update_plugins' ) ) {
@@ -93,7 +93,7 @@ if ( isset( $_GET['action'] ) ) {
 			error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
 			ini_set( 'display_errors', true ); //Ensure that Fatal errors are displayed.
 			wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
-			include( WP_PLUGIN_DIR . '/' . $plugin );
+			include WP_PLUGIN_DIR . '/' . $plugin;
 		}
 		iframe_footer();
 	} elseif ( 'install-plugin' == $action ) {
@@ -102,7 +102,7 @@ if ( isset( $_GET['action'] ) ) {
 			wp_die( __( 'Sorry, you are not allowed to install plugins on this site.' ) );
 		}
 
-		include_once( ABSPATH . 'wp-admin/includes/plugin-install.php' ); //for plugins_api..
+		include_once ABSPATH . 'wp-admin/includes/plugin-install.php'; //for plugins_api..
 
 		check_admin_referer( 'install-plugin_' . $plugin );
 		$api = plugins_api(
@@ -122,7 +122,7 @@ if ( isset( $_GET['action'] ) ) {
 		$title        = __( 'Plugin Installation' );
 		$parent_file  = 'plugins.php';
 		$submenu_file = 'plugin-install.php';
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		/* translators: %s: Plugin name and version. */
 		$title = sprintf( __( 'Installing Plugin: %s' ), $api->name . ' ' . $api->version );
@@ -137,7 +137,7 @@ if ( isset( $_GET['action'] ) ) {
 		$upgrader = new Plugin_Upgrader( new Plugin_Installer_Skin( compact( 'title', 'url', 'nonce', 'plugin', 'api' ) ) );
 		$upgrader->install( $api->download_link );
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 
 	} elseif ( 'upload-plugin' == $action ) {
 
@@ -152,7 +152,7 @@ if ( isset( $_GET['action'] ) ) {
 		$title        = __( 'Upload Plugin' );
 		$parent_file  = 'plugins.php';
 		$submenu_file = 'plugin-install.php';
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		/* translators: %s: File name. */
 		$title = sprintf( __( 'Installing Plugin from uploaded file: %s' ), esc_html( basename( $file_upload->filename ) ) );
@@ -167,7 +167,7 @@ if ( isset( $_GET['action'] ) ) {
 			$file_upload->cleanup();
 		}
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 
 	} elseif ( 'upgrade-theme' == $action ) {
 
@@ -182,7 +182,7 @@ if ( isset( $_GET['action'] ) ) {
 		$title        = __( 'Update Theme' );
 		$parent_file  = 'themes.php';
 		$submenu_file = 'themes.php';
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		$nonce = 'upgrade-theme_' . $theme;
 		$url   = 'update.php?action=upgrade-theme&theme=' . urlencode( $theme );
@@ -190,7 +190,7 @@ if ( isset( $_GET['action'] ) ) {
 		$upgrader = new Theme_Upgrader( new Theme_Upgrader_Skin( compact( 'title', 'nonce', 'url', 'theme' ) ) );
 		$upgrader->upgrade( $theme );
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 	} elseif ( 'update-selected-themes' == $action ) {
 		if ( ! current_user_can( 'update_themes' ) ) {
 			wp_die( __( 'Sorry, you are not allowed to update themes for this site.' ) );
@@ -224,7 +224,7 @@ if ( isset( $_GET['action'] ) ) {
 			wp_die( __( 'Sorry, you are not allowed to install themes on this site.' ) );
 		}
 
-		include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' ); //for themes_api..
+		include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php'; //for themes_api..
 
 		check_admin_referer( 'install-theme_' . $theme );
 		$api = themes_api(
@@ -245,7 +245,7 @@ if ( isset( $_GET['action'] ) ) {
 		$title        = __( 'Install Themes' );
 		$parent_file  = 'themes.php';
 		$submenu_file = 'themes.php';
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		/* translators: %s: Theme name and version. */
 		$title = sprintf( __( 'Installing Theme: %s' ), $api->name . ' ' . $api->version );
@@ -256,7 +256,7 @@ if ( isset( $_GET['action'] ) ) {
 		$upgrader = new Theme_Upgrader( new Theme_Installer_Skin( compact( 'title', 'url', 'nonce', 'plugin', 'api' ) ) );
 		$upgrader->install( $api->download_link );
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 
 	} elseif ( 'upload-theme' == $action ) {
 
@@ -272,7 +272,7 @@ if ( isset( $_GET['action'] ) ) {
 		$parent_file  = 'themes.php';
 		$submenu_file = 'theme-install.php';
 
-		require_once( ABSPATH . 'wp-admin/admin-header.php' );
+		require_once ABSPATH . 'wp-admin/admin-header.php';
 
 		/* translators: %s: File name. */
 		$title = sprintf( __( 'Installing Theme from uploaded file: %s' ), esc_html( basename( $file_upload->filename ) ) );
@@ -287,7 +287,7 @@ if ( isset( $_GET['action'] ) ) {
 			$file_upload->cleanup();
 		}
 
-		include( ABSPATH . 'wp-admin/admin-footer.php' );
+		include ABSPATH . 'wp-admin/admin-footer.php';
 
 	} else {
 		/**
diff --git src/wp-admin/upgrade-functions.php src/wp-admin/upgrade-functions.php
index 0669ead7b0..0d1f499a00 100644
--- src/wp-admin/upgrade-functions.php
+++ src/wp-admin/upgrade-functions.php
@@ -9,4 +9,4 @@
  */
 
 _deprecated_file( basename( __FILE__ ), '2.5.0', 'wp-admin/includes/upgrade.php' );
-require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+require_once ABSPATH . 'wp-admin/includes/upgrade.php';
diff --git src/wp-admin/upgrade.php src/wp-admin/upgrade.php
index 67555f4fe9..88388ea60d 100644
--- src/wp-admin/upgrade.php
+++ src/wp-admin/upgrade.php
@@ -15,11 +15,11 @@
 define( 'WP_INSTALLING', true );
 
 /** Load WordPress Bootstrap */
-require( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require dirname( __DIR__ ) . '/wp-load.php';
 
 nocache_headers();
 
-require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 delete_site_transient( 'update_core' );
 
diff --git src/wp-admin/upload.php src/wp-admin/upload.php
index a5a5d21612..0b9611f477 100644
--- src/wp-admin/upload.php
+++ src/wp-admin/upload.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'upload_files' ) ) {
 	wp_die( __( 'Sorry, you are not allowed to upload files.' ) );
@@ -79,7 +79,7 @@ if ( 'grid' === $mode ) {
 	$title       = __( 'Media Library' );
 	$parent_file = 'upload.php';
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' );
+	require_once ABSPATH . 'wp-admin/admin-header.php';
 	?>
 	<div class="wrap" id="wp-media-grid" data-search="<?php _admin_search_query(); ?>">
 		<h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>
@@ -107,7 +107,7 @@ if ( 'grid' === $mode ) {
 		</div>
 	</div>
 	<?php
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 	exit;
 }
 
@@ -261,7 +261,7 @@ get_current_screen()->set_screen_reader_content(
 	)
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -378,4 +378,4 @@ if ( ! empty( $message ) ) {
 </div>
 
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/user-edit.php src/wp-admin/user-edit.php
index 10e39e8b27..5411c7a910 100644
--- src/wp-admin/user-edit.php
+++ src/wp-admin/user-edit.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 wp_reset_vars( array( 'action', 'user_id', 'wp_http_referer' ) );
 
@@ -184,7 +184,7 @@ switch ( $action ) {
 		$title    = sprintf( $title, $profileuser->display_name );
 		$sessions = WP_Session_Tokens::get_instance( $profileuser->ID );
 
-		include( ABSPATH . 'wp-admin/admin-header.php' );
+		include ABSPATH . 'wp-admin/admin-header.php';
 		?>
 
 		<?php if ( ! IS_PROFILE_PAGE && is_super_admin( $profileuser->ID ) && current_user_can( 'manage_network_options' ) ) { ?>
@@ -789,4 +789,4 @@ endif; //!IS_PROFILE_PAGE
 	}
 </script>
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/user-new.php src/wp-admin/user-new.php
index 2abd094519..09fb50a5d7 100644
--- src/wp-admin/user-new.php
+++ src/wp-admin/user-new.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( is_multisite() ) {
 	if ( ! current_user_can( 'create_users' ) && ! current_user_can( 'promote_users' ) ) {
@@ -285,7 +285,7 @@ if ( is_multisite() && current_user_can( 'promote_users' ) && ! wp_is_large_netw
 	wp_enqueue_script( 'user-suggest' );
 }
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 
 if ( isset( $_GET['update'] ) ) {
 	$messages = array();
@@ -582,4 +582,4 @@ if ( current_user_can( 'create_users' ) ) {
 <?php } // current_user_can('create_users') ?>
 </div>
 <?php
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/user/about.php src/wp-admin/user/about.php
index b7943550e9..af06c62222 100644
--- src/wp-admin/user/about.php
+++ src/wp-admin/user/about.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/about.php' );
+require ABSPATH . 'wp-admin/about.php';
diff --git src/wp-admin/user/admin.php src/wp-admin/user/admin.php
index 9df8f2029e..d1ca849315 100644
--- src/wp-admin/user/admin.php
+++ src/wp-admin/user/admin.php
@@ -9,7 +9,7 @@
 
 define( 'WP_USER_ADMIN', true );
 
-require_once( dirname( dirname( __FILE__ ) ) . '/admin.php' );
+require_once dirname( __DIR__ ) . '/admin.php';
 
 if ( ! is_multisite() ) {
 	wp_redirect( admin_url() );
diff --git src/wp-admin/user/credits.php src/wp-admin/user/credits.php
index 2b4021acb9..b28461cdb2 100644
--- src/wp-admin/user/credits.php
+++ src/wp-admin/user/credits.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/credits.php' );
+require ABSPATH . 'wp-admin/credits.php';
diff --git src/wp-admin/user/freedoms.php src/wp-admin/user/freedoms.php
index d2b77b5615..9e2ebb009b 100644
--- src/wp-admin/user/freedoms.php
+++ src/wp-admin/user/freedoms.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/freedoms.php' );
+require ABSPATH . 'wp-admin/freedoms.php';
diff --git src/wp-admin/user/index.php src/wp-admin/user/index.php
index 7cff6a7053..58906ce4f0 100644
--- src/wp-admin/user/index.php
+++ src/wp-admin/user/index.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/index.php' );
+require ABSPATH . 'wp-admin/index.php';
diff --git src/wp-admin/user/menu.php src/wp-admin/user/menu.php
index 47ef784208..23e81a892c 100644
--- src/wp-admin/user/menu.php
+++ src/wp-admin/user/menu.php
@@ -19,4 +19,4 @@ $_wp_real_parent_file['users.php'] = 'profile.php';
 $compat                            = array();
 $submenu                           = array();
 
-require_once( ABSPATH . 'wp-admin/includes/menu.php' );
+require_once ABSPATH . 'wp-admin/includes/menu.php';
diff --git src/wp-admin/user/privacy.php src/wp-admin/user/privacy.php
index 8b28eea618..207f29df20 100644
--- src/wp-admin/user/privacy.php
+++ src/wp-admin/user/privacy.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/privacy.php' );
+require ABSPATH . 'wp-admin/privacy.php';
diff --git src/wp-admin/user/profile.php src/wp-admin/user/profile.php
index 2f70709906..f9bd631268 100644
--- src/wp-admin/user/profile.php
+++ src/wp-admin/user/profile.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/profile.php' );
+require ABSPATH . 'wp-admin/profile.php';
diff --git src/wp-admin/user/user-edit.php src/wp-admin/user/user-edit.php
index 0819573f6f..4cc64efb14 100644
--- src/wp-admin/user/user-edit.php
+++ src/wp-admin/user/user-edit.php
@@ -8,6 +8,6 @@
  */
 
 /** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
-require( ABSPATH . 'wp-admin/user-edit.php' );
+require ABSPATH . 'wp-admin/user-edit.php';
diff --git src/wp-admin/users.php src/wp-admin/users.php
index 48e169d69c..5b435c014b 100644
--- src/wp-admin/users.php
+++ src/wp-admin/users.php
@@ -8,7 +8,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 if ( ! current_user_can( 'list_users' ) ) {
 	wp_die(
@@ -263,7 +263,7 @@ switch ( $wp_list_table->current_action() ) {
 			add_action( 'admin_head', 'delete_users_add_js' );
 		}
 
-		include( ABSPATH . 'wp-admin/admin-header.php' );
+		include ABSPATH . 'wp-admin/admin-header.php';
 		?>
 	<form method="post" name="updateusers" id="updateusers">
 		<?php wp_nonce_field( 'delete-users' ); ?>
@@ -405,7 +405,7 @@ switch ( $wp_list_table->current_action() ) {
 			$userids = $_REQUEST['users'];
 		}
 
-		include( ABSPATH . 'wp-admin/admin-header.php' );
+		include ABSPATH . 'wp-admin/admin-header.php';
 		?>
 	<form method="post" name="updateusers" id="updateusers">
 		<?php wp_nonce_field( 'remove-users' ); ?>
@@ -474,7 +474,7 @@ switch ( $wp_list_table->current_action() ) {
 			exit;
 		}
 
-		include( ABSPATH . 'wp-admin/admin-header.php' );
+		include ABSPATH . 'wp-admin/admin-header.php';
 
 		$messages = array();
 		if ( isset( $_GET['update'] ) ) :
@@ -596,4 +596,4 @@ if ( strlen( $usersearch ) ) {
 
 } // end of the $doaction switch
 
-include( ABSPATH . 'wp-admin/admin-footer.php' );
+include ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-admin/widgets.php src/wp-admin/widgets.php
index ada2bdd790..8e954cf077 100644
--- src/wp-admin/widgets.php
+++ src/wp-admin/widgets.php
@@ -7,10 +7,10 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once __DIR__ . '/admin.php';
 
 /** WordPress Administration Widgets API */
-require_once( ABSPATH . 'wp-admin/includes/widgets.php' );
+require_once ABSPATH . 'wp-admin/includes/widgets.php';
 
 if ( ! current_user_can( 'edit_theme_options' ) ) {
 	wp_die(
@@ -288,7 +288,7 @@ if ( isset( $_GET['editwidget'] ) && $_GET['editwidget'] ) {
 	$width = ' style="width:' . max( $control['width'], 350 ) . 'px"';
 	$key   = isset( $_GET['key'] ) ? (int) $_GET['key'] : 0;
 
-	require_once( ABSPATH . 'wp-admin/admin-header.php' ); ?>
+	require_once ABSPATH . 'wp-admin/admin-header.php'; ?>
 	<div class="wrap">
 	<h1><?php echo esc_html( $title ); ?></h1>
 	<div class="editwidget"<?php echo $width; ?>>
@@ -366,7 +366,7 @@ if ( isset( $_GET['editwidget'] ) && $_GET['editwidget'] ) {
 	</div>
 	</div>
 	<?php
-	require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+	require_once ABSPATH . 'wp-admin/admin-footer.php';
 	exit;
 }
 
@@ -379,7 +379,7 @@ $errors = array(
 	__( 'Error in displaying the widget settings form.' ),
 );
 
-require_once( ABSPATH . 'wp-admin/admin-header.php' );
+require_once ABSPATH . 'wp-admin/admin-header.php';
 ?>
 
 <div class="wrap">
@@ -572,4 +572,4 @@ foreach ( $theme_sidebars as $sidebar => $registered_sidebar ) {
  * @since 2.2.0
  */
 do_action( 'sidebar_admin_page' );
-require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+require_once ABSPATH . 'wp-admin/admin-footer.php';
diff --git src/wp-blog-header.php src/wp-blog-header.php
index a8b1efc7b5..91e3b9daf4 100644
--- src/wp-blog-header.php
+++ src/wp-blog-header.php
@@ -10,12 +10,12 @@ if ( ! isset( $wp_did_header ) ) {
 	$wp_did_header = true;
 
 	// Load the WordPress library.
-	require_once( dirname( __FILE__ ) . '/wp-load.php' );
+	require_once __DIR__ . '/wp-load.php';
 
 	// Set up the WordPress query.
 	wp();
 
 	// Load the theme template.
-	require_once( ABSPATH . WPINC . '/template-loader.php' );
+	require_once ABSPATH . WPINC . '/template-loader.php';
 
 }
diff --git src/wp-comments-post.php src/wp-comments-post.php
index 86c758cc0a..ebf658603d 100644
--- src/wp-comments-post.php
+++ src/wp-comments-post.php
@@ -18,7 +18,7 @@ if ( 'POST' !== $_SERVER['REQUEST_METHOD'] ) {
 }
 
 /** Sets up the WordPress Environment. */
-require( dirname( __FILE__ ) . '/wp-load.php' );
+require __DIR__ . '/wp-load.php';
 
 nocache_headers();
 
diff --git src/wp-content/themes/twentyeleven/functions.php src/wp-content/themes/twentyeleven/functions.php
index d1d7d69bde..4bc6c16ae4 100644
--- src/wp-content/themes/twentyeleven/functions.php
+++ src/wp-content/themes/twentyeleven/functions.php
@@ -132,10 +132,10 @@ if ( ! function_exists( 'twentyeleven_setup' ) ) :
 		);
 
 		// Load up our theme options page and related code.
-		require( get_template_directory() . '/inc/theme-options.php' );
+		require get_template_directory() . '/inc/theme-options.php';
 
 		// Grab Twenty Eleven's Ephemera widget.
-		require( get_template_directory() . '/inc/widgets.php' );
+		require get_template_directory() . '/inc/widgets.php';
 
 		// Add default posts and comments RSS feed links to <head>.
 		add_theme_support( 'automatic-feed-links' );
diff --git src/wp-content/themes/twentyseventeen/functions.php src/wp-content/themes/twentyseventeen/functions.php
index 7e5cb84c0b..1ef1b570a7 100644
--- src/wp-content/themes/twentyseventeen/functions.php
+++ src/wp-content/themes/twentyseventeen/functions.php
@@ -425,7 +425,7 @@ function twentyseventeen_colors_css_wrap() {
 		return;
 	}
 
-	require_once( get_parent_theme_file_path( '/inc/color-patterns.php' ) );
+	require_once get_parent_theme_file_path( '/inc/color-patterns.php' );
 	$hue = absint( get_theme_mod( 'colorscheme_hue', 250 ) );
 
 	$customize_preview_data_hue = '';
diff --git src/wp-content/themes/twentyseventeen/inc/icon-functions.php src/wp-content/themes/twentyseventeen/inc/icon-functions.php
index c906762b58..11a1b0be16 100644
--- src/wp-content/themes/twentyseventeen/inc/icon-functions.php
+++ src/wp-content/themes/twentyseventeen/inc/icon-functions.php
@@ -16,7 +16,7 @@ function twentyseventeen_include_svg_icons() {
 
 	// If it exists, include it.
 	if ( file_exists( $svg_icons ) ) {
-		require_once( $svg_icons );
+		require_once $svg_icons;
 	}
 }
 add_action( 'wp_footer', 'twentyseventeen_include_svg_icons', 9999 );
diff --git src/wp-content/themes/twentytwelve/functions.php src/wp-content/themes/twentytwelve/functions.php
index 04da105b06..018d1c36fd 100644
--- src/wp-content/themes/twentytwelve/functions.php
+++ src/wp-content/themes/twentytwelve/functions.php
@@ -130,7 +130,7 @@ add_action( 'after_setup_theme', 'twentytwelve_setup' );
 /**
  * Add support for a custom header image.
  */
-require( get_template_directory() . '/inc/custom-header.php' );
+require get_template_directory() . '/inc/custom-header.php';
 
 /**
  * Return the Google font stylesheet URL if available.
diff --git src/wp-cron.php src/wp-cron.php
index 561ae96559..333625c069 100644
--- src/wp-cron.php
+++ src/wp-cron.php
@@ -41,7 +41,7 @@ define( 'DOING_CRON', true );
 
 if ( ! defined( 'ABSPATH' ) ) {
 	/** Set up WordPress environment */
-	require_once( dirname( __FILE__ ) . '/wp-load.php' );
+	require_once __DIR__ . '/wp-load.php';
 }
 
 /**
diff --git src/wp-includes/admin-bar.php src/wp-includes/admin-bar.php
index 77ab5848ee..90d7e8ca03 100644
--- src/wp-includes/admin-bar.php
+++ src/wp-includes/admin-bar.php
@@ -28,7 +28,7 @@ function _wp_admin_bar_init() {
 	}
 
 	/* Load the admin bar class code ready for instantiation */
-	require_once( ABSPATH . WPINC . '/class-wp-admin-bar.php' );
+	require_once ABSPATH . WPINC . '/class-wp-admin-bar.php';
 
 	/* Instantiate the admin bar */
 
diff --git src/wp-includes/blocks/rss.php src/wp-includes/blocks/rss.php
index 0315cfc013..0300585de2 100644
--- src/wp-includes/blocks/rss.php
+++ src/wp-includes/blocks/rss.php
@@ -20,6 +20,10 @@ function render_block_core_rss( $attributes ) {
 	}
 
 	if ( ! $rss->get_item_quantity() ) {
+		// PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
+		$rss->__destruct();
+		unset( $rss );
+
 		return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'An error has occurred, which probably means the feed is down. Try again later.' ) . '</div></div>';
 	}
 
@@ -92,7 +96,13 @@ function render_block_core_rss( $attributes ) {
 		$class .= ' ' . $attributes['className'];
 	}
 
-	return "<ul class='{$class}'>{$list_items}</ul>";
+	$list_items_markup = "<ul class='{$class}'>{$list_items}</ul>";
+
+	// PHP 5.2 compatibility. See: http://simplepie.org/wiki/faq/i_m_getting_memory_leaks.
+	$rss->__destruct();
+	unset( $rss );
+
+	return $list_items_markup;
 }
 
 /**
diff --git src/wp-includes/blocks/search.php src/wp-includes/blocks/search.php
index 67bc90ff35..6cd909fc6f 100644
--- src/wp-includes/blocks/search.php
+++ src/wp-includes/blocks/search.php
@@ -25,12 +25,6 @@ function render_block_core_search( $attributes ) {
 			$input_id,
 			$attributes['label']
 		);
-	} else {
-		$label_markup = sprintf(
-			'<label for="%s" class="wp-block-search__label screen-reader-text">%s</label>',
-			$input_id,
-			__( 'Search' )
-		);
 	}
 
 	$input_markup = sprintf(
@@ -51,6 +45,7 @@ function render_block_core_search( $attributes ) {
 	if ( isset( $attributes['className'] ) ) {
 		$class .= ' ' . $attributes['className'];
 	}
+
 	if ( isset( $attributes['align'] ) ) {
 		$class .= ' align' . $attributes['align'];
 	}
diff --git src/wp-includes/class-IXR.php src/wp-includes/class-IXR.php
index 706e5e320a..0cd72df20e 100644
--- src/wp-includes/class-IXR.php
+++ src/wp-includes/class-IXR.php
@@ -39,22 +39,22 @@
  * @license    http://www.opensource.org/licenses/bsd-license.php BSD
  */
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-server.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-server.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-base64.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-base64.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-client.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-client.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-clientmulticall.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-clientmulticall.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-date.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-date.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-error.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-error.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-introspectionserver.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-introspectionserver.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-message.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-message.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-request.php' );
+require_once ABSPATH . WPINC . '/IXR/class-IXR-request.php';
 
-require_once( ABSPATH . WPINC . '/IXR/class-IXR-value.php' );
\ No newline at end of file
+require_once ABSPATH . WPINC . '/IXR/class-IXR-value.php';
\ No newline at end of file
diff --git src/wp-includes/class-feed.php src/wp-includes/class-feed.php
index 5236170450..9a4772dc75 100644
--- src/wp-includes/class-feed.php
+++ src/wp-includes/class-feed.php
@@ -10,10 +10,10 @@
 _deprecated_file( basename( __FILE__ ), '4.7.0', 'fetch_feed()' );
 
 if ( ! class_exists( 'SimplePie', false ) ) {
-	require_once( ABSPATH . WPINC . '/class-simplepie.php' );
+	require_once ABSPATH . WPINC . '/class-simplepie.php';
 }
 
-require_once( ABSPATH . WPINC . '/class-wp-feed-cache.php' );
-require_once( ABSPATH . WPINC . '/class-wp-feed-cache-transient.php' );
-require_once( ABSPATH . WPINC . '/class-wp-simplepie-file.php' );
-require_once( ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php' );
+require_once ABSPATH . WPINC . '/class-wp-feed-cache.php';
+require_once ABSPATH . WPINC . '/class-wp-feed-cache-transient.php';
+require_once ABSPATH . WPINC . '/class-wp-simplepie-file.php';
+require_once ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php';
diff --git src/wp-includes/class-http.php src/wp-includes/class-http.php
index 9e18811c28..70496645d8 100644
--- src/wp-includes/class-http.php
+++ src/wp-includes/class-http.php
@@ -8,7 +8,7 @@
  */
 
 if ( ! class_exists( 'Requests' ) ) {
-	require( ABSPATH . WPINC . '/class-requests.php' );
+	require ABSPATH . WPINC . '/class-requests.php';
 
 	Requests::register_autoloader();
 	Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' );
diff --git src/wp-includes/class-oembed.php src/wp-includes/class-oembed.php
index 3b39e97df8..747fffa77a 100644
--- src/wp-includes/class-oembed.php
+++ src/wp-includes/class-oembed.php
@@ -12,4 +12,4 @@
 _deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-includes/class-wp-oembed.php' );
 
 /** WP_oEmbed class */
-require_once( ABSPATH . 'wp-includes/class-wp-oembed.php' );
+require_once ABSPATH . 'wp-includes/class-wp-oembed.php';
diff --git src/wp-includes/class-phpmailer.php src/wp-includes/class-phpmailer.php
index 7aaa850532..30754a4e6c 100644
--- src/wp-includes/class-phpmailer.php
+++ src/wp-includes/class-phpmailer.php
@@ -1534,7 +1534,7 @@ class PHPMailer
     public function getSMTPInstance()
     {
         if (!is_object($this->smtp)) {
-			require_once( 'class-smtp.php' );
+			require_once 'class-smtp.php';
             $this->smtp = new SMTP;
         }
         return $this->smtp;
diff --git src/wp-includes/class-simplepie.php src/wp-includes/class-simplepie.php
index 6110413767..348657f5d9 100644
--- src/wp-includes/class-simplepie.php
+++ src/wp-includes/class-simplepie.php
@@ -26,7 +26,7 @@ function wp_simplepie_autoload( $class ) {
 		return;
 
 	$file = ABSPATH . WPINC . '/' . str_replace( '_', '/', $class ) . '.php';
-	include( $file );
+	include $file;
 }
 
 /**
diff --git src/wp-includes/class-wp-customize-control.php src/wp-includes/class-wp-customize-control.php
index 994ff90805..ca088cd422 100644
--- src/wp-includes/class-wp-customize-control.php
+++ src/wp-includes/class-wp-customize-control.php
@@ -693,77 +693,77 @@ class WP_Customize_Control {
 /**
  * WP_Customize_Color_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php';
 
 /**
  * WP_Customize_Media_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php';
 
 /**
  * WP_Customize_Upload_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php';
 
 /**
  * WP_Customize_Image_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php';
 
 /**
  * WP_Customize_Background_Image_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php';
 
 /**
  * WP_Customize_Background_Position_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php';
 
 /**
  * WP_Customize_Cropped_Image_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php';
 
 /**
  * WP_Customize_Site_Icon_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php';
 
 /**
  * WP_Customize_Header_Image_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php';
 
 /**
  * WP_Customize_Theme_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php';
 
 /**
  * WP_Widget_Area_Customize_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php';
 
 /**
  * WP_Widget_Form_Customize_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Item_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Location_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Name_Control class.
@@ -774,19 +774,19 @@ require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location
  *
  * @deprecated 4.9.0 This file is no longer used due to new menu creation UX.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Locations_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php';
 
 /**
  * WP_Customize_Nav_Menu_Auto_Add_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php';
 
 /**
  * WP_Customize_Date_Time_Control class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-date-time-control.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-date-time-control.php';
diff --git src/wp-includes/class-wp-customize-manager.php src/wp-includes/class-wp-customize-manager.php
index d65f82ad42..412282b44a 100644
--- src/wp-includes/class-wp-customize-manager.php
+++ src/wp-includes/class-wp-customize-manager.php
@@ -293,44 +293,44 @@ final class WP_Customize_Manager {
 			}
 		}
 
-		require_once( ABSPATH . WPINC . '/class-wp-customize-setting.php' );
-		require_once( ABSPATH . WPINC . '/class-wp-customize-panel.php' );
-		require_once( ABSPATH . WPINC . '/class-wp-customize-section.php' );
-		require_once( ABSPATH . WPINC . '/class-wp-customize-control.php' );
-
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-code-editor-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php' );
-
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php' );
-
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-panel.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php' );
-
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-custom-css-setting.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );
+		require_once ABSPATH . WPINC . '/class-wp-customize-setting.php';
+		require_once ABSPATH . WPINC . '/class-wp-customize-panel.php';
+		require_once ABSPATH . WPINC . '/class-wp-customize-section.php';
+		require_once ABSPATH . WPINC . '/class-wp-customize-control.php';
+
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-code-editor-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php';
+
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php';
+
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-panel.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php';
+
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-custom-css-setting.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php';
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php';
 
 		/**
 		 * Filters the core Customizer components to load.
@@ -349,16 +349,16 @@ final class WP_Customize_Manager {
 		 */
 		$components = apply_filters( 'customize_loaded_components', $this->components, $this );
 
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-selective-refresh.php' );
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-selective-refresh.php';
 		$this->selective_refresh = new WP_Customize_Selective_Refresh( $this );
 
 		if ( in_array( 'widgets', $components, true ) ) {
-			require_once( ABSPATH . WPINC . '/class-wp-customize-widgets.php' );
+			require_once ABSPATH . WPINC . '/class-wp-customize-widgets.php';
 			$this->widgets = new WP_Customize_Widgets( $this );
 		}
 
 		if ( in_array( 'nav_menus', $components, true ) ) {
-			require_once( ABSPATH . WPINC . '/class-wp-customize-nav-menus.php' );
+			require_once ABSPATH . WPINC . '/class-wp-customize-nav-menus.php';
 			$this->nav_menus = new WP_Customize_Nav_Menus( $this );
 		}
 
@@ -1639,9 +1639,9 @@ final class WP_Customize_Manager {
 		}
 
 		// Such is The WordPress Way.
-		require_once( ABSPATH . 'wp-admin/includes/file.php' );
-		require_once( ABSPATH . 'wp-admin/includes/media.php' );
-		require_once( ABSPATH . 'wp-admin/includes/image.php' );
+		require_once ABSPATH . 'wp-admin/includes/file.php';
+		require_once ABSPATH . 'wp-admin/includes/media.php';
+		require_once ABSPATH . 'wp-admin/includes/image.php';
 
 		foreach ( $attachments as $symbol => $attachment ) {
 
diff --git src/wp-includes/class-wp-customize-panel.php src/wp-includes/class-wp-customize-panel.php
index 82eda3a0f6..185908bea8 100644
--- src/wp-includes/class-wp-customize-panel.php
+++ src/wp-includes/class-wp-customize-panel.php
@@ -379,4 +379,4 @@ class WP_Customize_Panel {
 }
 
 /** WP_Customize_Nav_Menus_Panel class */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php';
diff --git src/wp-includes/class-wp-customize-section.php src/wp-includes/class-wp-customize-section.php
index 57cc8d3bff..47ff0910ba 100644
--- src/wp-includes/class-wp-customize-section.php
+++ src/wp-includes/class-wp-customize-section.php
@@ -376,10 +376,10 @@ class WP_Customize_Section {
 }
 
 /** WP_Customize_Themes_Section class */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php';
 
 /** WP_Customize_Sidebar_Section class */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php';
 
 /** WP_Customize_Nav_Menu_Section class */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php';
diff --git src/wp-includes/class-wp-customize-setting.php src/wp-includes/class-wp-customize-setting.php
index c5efd0a7ee..1e6a165021 100644
--- src/wp-includes/class-wp-customize-setting.php
+++ src/wp-includes/class-wp-customize-setting.php
@@ -943,24 +943,24 @@ class WP_Customize_Setting {
 /**
  * WP_Customize_Filter_Setting class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php';
 
 /**
  * WP_Customize_Header_Image_Setting class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php';
 
 /**
  * WP_Customize_Background_Image_Setting class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php';
 
 /**
  * WP_Customize_Nav_Menu_Item_Setting class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php';
 
 /**
  * WP_Customize_Nav_Menu_Setting class.
  */
-require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );
+require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php';
diff --git src/wp-includes/class-wp-editor.php src/wp-includes/class-wp-editor.php
index 26824dfa9b..8a2439fe7e 100644
--- src/wp-includes/class-wp-editor.php
+++ src/wp-includes/class-wp-editor.php
@@ -225,7 +225,7 @@ final class _WP_Editors {
 				self::$has_medialib = true;
 
 				if ( ! function_exists( 'media_buttons' ) ) {
-					include( ABSPATH . 'wp-admin/includes/media.php' );
+					include ABSPATH . 'wp-admin/includes/media.php';
 				}
 
 				echo '<div id="wp-' . $editor_id_attr . '-media-buttons" class="wp-media-buttons">';
@@ -496,7 +496,7 @@ final class _WP_Editors {
 						if ( ! empty( $mce_external_languages ) ) {
 							foreach ( $mce_external_languages as $name => $path ) {
 								if ( @is_file( $path ) && @is_readable( $path ) ) {
-									include_once( $path );
+									include_once $path;
 									$ext_plugins   .= $strings . "\n";
 									$loaded_langs[] = $name;
 								}
diff --git src/wp-includes/comment-template.php src/wp-includes/comment-template.php
index a031c9a88c..22ab515501 100644
--- src/wp-includes/comment-template.php
+++ src/wp-includes/comment-template.php
@@ -1506,11 +1506,11 @@ function comments_template( $file = '/comments.php', $separate_comments = false
 	 */
 	$include = apply_filters( 'comments_template', $theme_template );
 	if ( file_exists( $include ) ) {
-		require( $include );
+		require $include;
 	} elseif ( file_exists( TEMPLATEPATH . $file ) ) {
-		require( TEMPLATEPATH . $file );
+		require TEMPLATEPATH . $file;
 	} else { // Backward compat code will be removed in a future release
-		require( ABSPATH . WPINC . '/theme-compat/comments.php' );
+		require ABSPATH . WPINC . '/theme-compat/comments.php';
 	}
 }
 
diff --git src/wp-includes/comment.php src/wp-includes/comment.php
index fca5ab9db4..73e82cf4ec 100644
--- src/wp-includes/comment.php
+++ src/wp-includes/comment.php
@@ -2801,8 +2801,8 @@ function generic_ping( $post_id = 0 ) {
  * @param int|WP_Post $post_id Post Object or ID.
  */
 function pingback( $content, $post_id ) {
-	include_once( ABSPATH . WPINC . '/class-IXR.php' );
-	include_once( ABSPATH . WPINC . '/class-wp-http-ixr-client.php' );
+	include_once ABSPATH . WPINC . '/class-IXR.php';
+	include_once ABSPATH . WPINC . '/class-wp-http-ixr-client.php';
 
 	// original code by Mort (http://mort.mine.nu:8080)
 	$post_links = array();
@@ -2957,8 +2957,8 @@ function trackback( $trackback_url, $title, $excerpt, $ID ) {
  * @param string $path Path to send the ping.
  */
 function weblog_ping( $server = '', $path = '' ) {
-	include_once( ABSPATH . WPINC . '/class-IXR.php' );
-	include_once( ABSPATH . WPINC . '/class-wp-http-ixr-client.php' );
+	include_once ABSPATH . WPINC . '/class-IXR.php';
+	include_once ABSPATH . WPINC . '/class-wp-http-ixr-client.php';
 
 	// using a timeout of 3 seconds should be enough to cover slow servers
 	$client             = new WP_HTTP_IXR_Client( $server, ( ( ! strlen( trim( $path ) ) || ( '/' == $path ) ) ? false : $path ) );
diff --git src/wp-includes/cron.php src/wp-includes/cron.php
index 09d9735fbf..f38d70f961 100644
--- src/wp-includes/cron.php
+++ src/wp-includes/cron.php
@@ -680,7 +680,7 @@ function spawn_cron( $gmt_time = 0 ) {
 		wp_ob_end_flush_all();
 		flush();
 
-		include_once( ABSPATH . 'wp-cron.php' );
+		include_once ABSPATH . 'wp-cron.php';
 		return true;
 	}
 
diff --git src/wp-includes/customize/class-wp-customize-header-image-setting.php src/wp-includes/customize/class-wp-customize-header-image-setting.php
index 8aef690d93..e8328a991d 100644
--- src/wp-includes/customize/class-wp-customize-header-image-setting.php
+++ src/wp-includes/customize/class-wp-customize-header-image-setting.php
@@ -31,7 +31,7 @@ final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
 
 		// If _custom_header_background_just_in_time() fails to initialize $custom_image_header when not is_admin().
 		if ( empty( $custom_image_header ) ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-custom-image-header.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
 			$args                   = get_theme_support( 'custom-header' );
 			$admin_head_callback    = isset( $args[0]['admin-head-callback'] ) ? $args[0]['admin-head-callback'] : null;
 			$admin_preview_callback = isset( $args[0]['admin-preview-callback'] ) ? $args[0]['admin-preview-callback'] : null;
diff --git src/wp-includes/customize/class-wp-customize-selective-refresh.php src/wp-includes/customize/class-wp-customize-selective-refresh.php
index 0b5c446131..be524bea19 100644
--- src/wp-includes/customize/class-wp-customize-selective-refresh.php
+++ src/wp-includes/customize/class-wp-customize-selective-refresh.php
@@ -62,7 +62,7 @@ final class WP_Customize_Selective_Refresh {
 	 */
 	public function __construct( WP_Customize_Manager $manager ) {
 		$this->manager = $manager;
-		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-partial.php' );
+		require_once ABSPATH . WPINC . '/customize/class-wp-customize-partial.php';
 
 		add_action( 'customize_preview_init', array( $this, 'init_preview' ) );
 	}
diff --git src/wp-includes/date.php src/wp-includes/date.php
index 3536e535b0..26ffcb4513 100644
--- src/wp-includes/date.php
+++ src/wp-includes/date.php
@@ -11,4 +11,4 @@
 _deprecated_file( basename( __FILE__ ), '5.3.0', 'wp-includes/class-wp-date-query.php' );
 
 /** WP_Date_Query class */
-require_once( ABSPATH . 'wp-includes/class-wp-date-query.php' );
+require_once ABSPATH . 'wp-includes/class-wp-date-query.php';
diff --git src/wp-includes/default-widgets.php src/wp-includes/default-widgets.php
index 767002b642..173573a3dd 100644
--- src/wp-includes/default-widgets.php
+++ src/wp-includes/default-widgets.php
@@ -8,58 +8,58 @@
  */
 
 /** WP_Widget_Pages class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-pages.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-pages.php';
 
 /** WP_Widget_Links class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-links.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-links.php';
 
 /** WP_Widget_Search class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-search.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-search.php';
 
 /** WP_Widget_Archives class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-archives.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-archives.php';
 
 /** WP_Widget_Media class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-media.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-media.php';
 
 /** WP_Widget_Media_Audio class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-media-audio.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-media-audio.php';
 
 /** WP_Widget_Media_Image class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-media-image.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-media-image.php';
 
 /** WP_Widget_Media_Video class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-media-video.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-media-video.php';
 
 /** WP_Widget_Media_Gallery class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-media-gallery.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-media-gallery.php';
 
 /** WP_Widget_Meta class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-meta.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-meta.php';
 
 /** WP_Widget_Calendar class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-calendar.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-calendar.php';
 
 /** WP_Widget_Text class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-text.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-text.php';
 
 /** WP_Widget_Categories class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-categories.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-categories.php';
 
 /** WP_Widget_Recent_Posts class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-recent-posts.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-recent-posts.php';
 
 /** WP_Widget_Recent_Comments class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-recent-comments.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-recent-comments.php';
 
 /** WP_Widget_RSS class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-rss.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-rss.php';
 
 /** WP_Widget_Tag_Cloud class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-tag-cloud.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-tag-cloud.php';
 
 /** WP_Nav_Menu_Widget class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-nav-menu-widget.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-nav-menu-widget.php';
 
 /** WP_Widget_Custom_HTML class */
-require_once( ABSPATH . WPINC . '/widgets/class-wp-widget-custom-html.php' );
+require_once ABSPATH . WPINC . '/widgets/class-wp-widget-custom-html.php';
diff --git src/wp-includes/deprecated.php src/wp-includes/deprecated.php
index d118f564e4..dc292301e6 100644
--- src/wp-includes/deprecated.php
+++ src/wp-includes/deprecated.php
@@ -3926,7 +3926,7 @@ function get_shortcut_link() {
 function wp_ajax_press_this_save_post() {
 	_deprecated_function( __FUNCTION__, '4.9.0' );
 	if ( is_plugin_active( 'press-this/press-this-plugin.php' ) ) {
-		include( WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php' );
+		include WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php';
 		$wp_press_this = new WP_Press_This_Plugin();
 		$wp_press_this->save_post();
 	} else {
@@ -3943,7 +3943,7 @@ function wp_ajax_press_this_save_post() {
 function wp_ajax_press_this_add_category() {
 	_deprecated_function( __FUNCTION__, '4.9.0' );
 	if ( is_plugin_active( 'press-this/press-this-plugin.php' ) ) {
-		include( WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php' );
+		include WP_PLUGIN_DIR . '/press-this/class-wp-press-this-plugin.php';
 		$wp_press_this = new WP_Press_This_Plugin();
 		$wp_press_this->add_category();
 	} else {
diff --git src/wp-includes/embed-template.php src/wp-includes/embed-template.php
index fb20991584..cec65454da 100644
--- src/wp-includes/embed-template.php
+++ src/wp-includes/embed-template.php
@@ -10,4 +10,4 @@
 
 _deprecated_file( basename( __FILE__ ), '4.5.0', 'wp-includes/theme-compat/embed.php' );
 
-include( ABSPATH . WPINC . '/theme-compat/embed.php' );
+include ABSPATH . WPINC . '/theme-compat/embed.php';
diff --git src/wp-includes/feed.php src/wp-includes/feed.php
index aa17296c0c..43457cf56b 100644
--- src/wp-includes/feed.php
+++ src/wp-includes/feed.php
@@ -751,13 +751,13 @@ function feed_content_type( $type = '' ) {
  */
 function fetch_feed( $url ) {
 	if ( ! class_exists( 'SimplePie', false ) ) {
-		require_once( ABSPATH . WPINC . '/class-simplepie.php' );
+		require_once ABSPATH . WPINC . '/class-simplepie.php';
 	}
 
-	require_once( ABSPATH . WPINC . '/class-wp-feed-cache.php' );
-	require_once( ABSPATH . WPINC . '/class-wp-feed-cache-transient.php' );
-	require_once( ABSPATH . WPINC . '/class-wp-simplepie-file.php' );
-	require_once( ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php' );
+	require_once ABSPATH . WPINC . '/class-wp-feed-cache.php';
+	require_once ABSPATH . WPINC . '/class-wp-feed-cache-transient.php';
+	require_once ABSPATH . WPINC . '/class-wp-simplepie-file.php';
+	require_once ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php';
 
 	$feed = new SimplePie();
 
diff --git src/wp-includes/functions.php src/wp-includes/functions.php
index 67a6cd6dc5..de9e6aff9b 100644
--- src/wp-includes/functions.php
+++ src/wp-includes/functions.php
@@ -5,7 +5,7 @@
  * @package WordPress
  */
 
-require( ABSPATH . WPINC . '/option.php' );
+require ABSPATH . WPINC . '/option.php';
 
 /**
  * Convert given MySQL date string into a different format.
@@ -833,7 +833,7 @@ function do_enclose( $content = null, $post ) {
 	global $wpdb;
 
 	// @todo Tidy this code and make the debug code optional.
-	include_once( ABSPATH . WPINC . '/class-IXR.php' );
+	include_once ABSPATH . WPINC . '/class-IXR.php';
 
 	$post = get_post( $post );
 	if ( ! $post ) {
@@ -4564,7 +4564,7 @@ function wp_maybe_load_widgets() {
 		return;
 	}
 
-	require_once( ABSPATH . WPINC . '/default-widgets.php' );
+	require_once ABSPATH . WPINC . '/default-widgets.php';
 
 	add_action( '_admin_menu', 'wp_widgets_add_menu' );
 }
@@ -4626,7 +4626,7 @@ function dead_db() {
 
 	// Load custom DB error template, if present.
 	if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
-		require_once( WP_CONTENT_DIR . '/db-error.php' );
+		require_once WP_CONTENT_DIR . '/db-error.php';
 		die();
 	}
 
@@ -7251,7 +7251,7 @@ function wp_privacy_delete_old_export_files() {
 		return;
 	}
 
-	require_once( ABSPATH . 'wp-admin/includes/file.php' );
+	require_once ABSPATH . 'wp-admin/includes/file.php';
 	$export_files = list_files( $exports_dir, 100, array( 'index.html' ) );
 
 	/**
diff --git src/wp-includes/general-template.php src/wp-includes/general-template.php
index 85aacb44ff..c799cd6271 100644
--- src/wp-includes/general-template.php
+++ src/wp-includes/general-template.php
@@ -255,7 +255,7 @@ function get_search_form( $args = array() ) {
 	$search_form_template = locate_template( 'searchform.php' );
 	if ( '' != $search_form_template ) {
 		ob_start();
-		require( $search_form_template );
+		require $search_form_template;
 		$form = ob_get_clean();
 	} else {
 		// Build a string containing an aria-label to use for the search form.
@@ -3408,7 +3408,7 @@ function wp_default_editor() {
  */
 function wp_editor( $content, $editor_id, $settings = array() ) {
 	if ( ! class_exists( '_WP_Editors', false ) ) {
-		require( ABSPATH . WPINC . '/class-wp-editor.php' );
+		require ABSPATH . WPINC . '/class-wp-editor.php';
 	}
 	_WP_Editors::editor( $content, $editor_id, $settings );
 }
@@ -3424,7 +3424,7 @@ function wp_editor( $content, $editor_id, $settings = array() ) {
  */
 function wp_enqueue_editor() {
 	if ( ! class_exists( '_WP_Editors', false ) ) {
-		require( ABSPATH . WPINC . '/class-wp-editor.php' );
+		require ABSPATH . WPINC . '/class-wp-editor.php';
 	}
 
 	_WP_Editors::enqueue_default_editor();
diff --git src/wp-includes/l10n.php src/wp-includes/l10n.php
index 9f211d4dc6..3067d8cc38 100644
--- src/wp-includes/l10n.php
+++ src/wp-includes/l10n.php
@@ -1463,7 +1463,7 @@ function wp_dropdown_languages( $args = array() ) {
 
 	$translations = $parsed_args['translations'];
 	if ( empty( $translations ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/translation-install.php' );
+		require_once ABSPATH . 'wp-admin/includes/translation-install.php';
 		$translations = wp_get_available_translations();
 	}
 
diff --git src/wp-includes/load.php src/wp-includes/load.php
index 28de0aa4f5..15166a1720 100644
--- src/wp-includes/load.php
+++ src/wp-includes/load.php
@@ -139,7 +139,7 @@ function wp_check_php_mysql_versions() {
 	}
 
 	if ( ! extension_loaded( 'mysql' ) && ! extension_loaded( 'mysqli' ) && ! extension_loaded( 'mysqlnd' ) && ! file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
-		require_once( ABSPATH . WPINC . '/functions.php' );
+		require_once ABSPATH . WPINC . '/functions.php';
 		wp_load_translations_early();
 		$args = array(
 			'exit' => false,
@@ -192,7 +192,7 @@ function wp_maintenance() {
 
 	global $upgrading;
 
-	include( ABSPATH . '.maintenance' );
+	include ABSPATH . '.maintenance';
 	// If the $upgrading timestamp is older than 10 minutes, don't die.
 	if ( ( time() - $upgrading ) >= 600 ) {
 		return;
@@ -216,11 +216,11 @@ function wp_maintenance() {
 	}
 
 	if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
-		require_once( WP_CONTENT_DIR . '/maintenance.php' );
+		require_once WP_CONTENT_DIR . '/maintenance.php';
 		die();
 	}
 
-	require_once( ABSPATH . WPINC . '/functions.php' );
+	require_once ABSPATH . WPINC . '/functions.php';
 	wp_load_translations_early();
 
 	header( 'Retry-After: 600' );
@@ -409,9 +409,9 @@ function wp_set_lang_dir() {
 function require_wp_db() {
 	global $wpdb;
 
-	require_once( ABSPATH . WPINC . '/wp-db.php' );
+	require_once ABSPATH . WPINC . '/wp-db.php';
 	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
-		require_once( WP_CONTENT_DIR . '/db.php' );
+		require_once WP_CONTENT_DIR . '/db.php';
 	}
 
 	if ( isset( $wpdb ) ) {
@@ -544,7 +544,7 @@ function wp_start_object_cache() {
 			 * that an external object cache is being used.
 			 */
 			if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
-				require_once( WP_CONTENT_DIR . '/object-cache.php' );
+				require_once WP_CONTENT_DIR . '/object-cache.php';
 				if ( function_exists( 'wp_cache_init' ) ) {
 					wp_using_ext_object_cache( true );
 				}
@@ -566,7 +566,7 @@ function wp_start_object_cache() {
 	}
 
 	if ( ! wp_using_ext_object_cache() ) {
-		require_once( ABSPATH . WPINC . '/cache.php' );
+		require_once ABSPATH . WPINC . '/cache.php';
 	}
 
 	/*
@@ -606,8 +606,8 @@ function wp_not_installed() {
 	} elseif ( ! is_blog_installed() && ! wp_installing() ) {
 		nocache_headers();
 
-		require( ABSPATH . WPINC . '/kses.php' );
-		require( ABSPATH . WPINC . '/pluggable.php' );
+		require ABSPATH . WPINC . '/kses.php';
+		require ABSPATH . WPINC . '/pluggable.php';
 
 		$link = wp_guess_url() . '/wp-admin/install.php';
 
diff --git src/wp-includes/ms-blogs.php src/wp-includes/ms-blogs.php
index 25dbe4b29f..950a335f0b 100644
--- src/wp-includes/ms-blogs.php
+++ src/wp-includes/ms-blogs.php
@@ -8,8 +8,8 @@
  * @since MU (3.0.0)
  */
 
-require_once( ABSPATH . WPINC . '/ms-site.php' );
-require_once( ABSPATH . WPINC . '/ms-network.php' );
+require_once ABSPATH . WPINC . '/ms-site.php';
+require_once ABSPATH . WPINC . '/ms-network.php';
 
 /**
  * Update the last_updated field for the current site.
diff --git src/wp-includes/ms-deprecated.php src/wp-includes/ms-deprecated.php
index 131c6da0cd..b88807d483 100644
--- src/wp-includes/ms-deprecated.php
+++ src/wp-includes/ms-deprecated.php
@@ -608,7 +608,7 @@ function install_blog( $blog_id, $blog_title = '' ) {
 	// Cast for security
 	$blog_id = (int) $blog_id;
 
-	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+	require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 	$suppress = $wpdb->suppress_errors();
 	if ( $wpdb->get_results( "DESCRIBE {$wpdb->posts}" ) ) {
@@ -675,7 +675,7 @@ function install_blog_defaults( $blog_id, $user_id ) {
 
 	_deprecated_function( __FUNCTION__, 'MU' );
 
-	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+	require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 	$suppress = $wpdb->suppress_errors();
 
diff --git src/wp-includes/ms-files.php src/wp-includes/ms-files.php
index 0f2c0798c8..1daa69f922 100644
--- src/wp-includes/ms-files.php
+++ src/wp-includes/ms-files.php
@@ -9,7 +9,7 @@
  */
 
 define( 'SHORTINIT', true );
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 if ( ! is_multisite() ) {
 	die( 'Multisite support not enabled' );
diff --git src/wp-includes/ms-settings.php src/wp-includes/ms-settings.php
index 1ebfb8bfb1..e260a970b7 100644
--- src/wp-includes/ms-settings.php
+++ src/wp-includes/ms-settings.php
@@ -32,19 +32,19 @@
 global $current_site, $current_blog, $domain, $path, $site_id, $public;
 
 /** WP_Network class */
-require_once( ABSPATH . WPINC . '/class-wp-network.php' );
+require_once ABSPATH . WPINC . '/class-wp-network.php';
 
 /** WP_Site class */
-require_once( ABSPATH . WPINC . '/class-wp-site.php' );
+require_once ABSPATH . WPINC . '/class-wp-site.php';
 
 /** Multisite loader */
-require_once( ABSPATH . WPINC . '/ms-load.php' );
+require_once ABSPATH . WPINC . '/ms-load.php';
 
 /** Default Multisite constants */
-require_once( ABSPATH . WPINC . '/ms-default-constants.php' );
+require_once ABSPATH . WPINC . '/ms-default-constants.php';
 
 if ( defined( 'SUNRISE' ) ) {
-	include_once( WP_CONTENT_DIR . '/sunrise.php' );
+	include_once WP_CONTENT_DIR . '/sunrise.php';
 }
 
 /** Check for and define SUBDOMAIN_INSTALL and the deprecated VHOST constant. */
diff --git src/wp-includes/ms-site.php src/wp-includes/ms-site.php
index e5f9af4758..0b2b466a37 100644
--- src/wp-includes/ms-site.php
+++ src/wp-includes/ms-site.php
@@ -717,7 +717,7 @@ function wp_initialize_site( $site_id, array $args = array() ) {
 		switch_to_blog( $site->id );
 	}
 
-	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+	require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 	// Set up the database tables.
 	make_db_current_silent( 'blog' );
diff --git src/wp-includes/pluggable.php src/wp-includes/pluggable.php
index a741ac4e78..5901ef9f03 100644
--- src/wp-includes/pluggable.php
+++ src/wp-includes/pluggable.php
@@ -2318,7 +2318,7 @@ if ( ! function_exists( 'wp_hash_password' ) ) :
 		global $wp_hasher;
 
 		if ( empty( $wp_hasher ) ) {
-			require_once( ABSPATH . WPINC . '/class-phpass.php' );
+			require_once ABSPATH . WPINC . '/class-phpass.php';
 			// By default, use the portable hash from phpass
 			$wp_hasher = new PasswordHash( 8, true );
 		}
@@ -2378,7 +2378,7 @@ if ( ! function_exists( 'wp_check_password' ) ) :
 		// If the stored hash is longer than an MD5, presume the
 		// new style phpass portable hash.
 		if ( empty( $wp_hasher ) ) {
-			require_once( ABSPATH . WPINC . '/class-phpass.php' );
+			require_once ABSPATH . WPINC . '/class-phpass.php';
 			// By default, use the portable hash from phpass
 			$wp_hasher = new PasswordHash( 8, true );
 		}
@@ -2741,7 +2741,7 @@ if ( ! function_exists( 'wp_text_diff' ) ) :
 		$args     = wp_parse_args( $args, $defaults );
 
 		if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) ) {
-			require( ABSPATH . WPINC . '/wp-diff.php' );
+			require ABSPATH . WPINC . '/wp-diff.php';
 		}
 
 		$left_string  = normalize_whitespace( $left_string );
diff --git src/wp-includes/plugin.php src/wp-includes/plugin.php
index 0ae29413c8..4953f9b90c 100644
--- src/wp-includes/plugin.php
+++ src/wp-includes/plugin.php
@@ -22,7 +22,7 @@
  */
 
 // Initialize the filter globals.
-require( dirname( __FILE__ ) . '/class-wp-hook.php' );
+require __DIR__ . '/class-wp-hook.php';
 
 /** @var WP_Hook[] $wp_filter */
 global $wp_filter, $wp_actions, $wp_current_filter;
diff --git src/wp-includes/pomo/mo.php src/wp-includes/pomo/mo.php
index 836af801cd..324aa3f4fe 100644
--- src/wp-includes/pomo/mo.php
+++ src/wp-includes/pomo/mo.php
@@ -7,8 +7,8 @@
  * @subpackage mo
  */
 
-require_once dirname( __FILE__ ) . '/translations.php';
-require_once dirname( __FILE__ ) . '/streams.php';
+require_once __DIR__ . '/translations.php';
+require_once __DIR__ . '/streams.php';
 
 if ( ! class_exists( 'MO', false ) ) :
 	class MO extends Gettext_Translations {
diff --git src/wp-includes/pomo/po.php src/wp-includes/pomo/po.php
index c16abf979a..4038f01d45 100644
--- src/wp-includes/pomo/po.php
+++ src/wp-includes/pomo/po.php
@@ -7,7 +7,7 @@
  * @subpackage po
  */
 
-require_once dirname( __FILE__ ) . '/translations.php';
+require_once __DIR__ . '/translations.php';
 
 if ( ! defined( 'PO_MAX_LINE_LEN' ) ) {
 	define( 'PO_MAX_LINE_LEN', 79 );
diff --git src/wp-includes/pomo/translations.php src/wp-includes/pomo/translations.php
index 720f427b0d..4a330e42f9 100644
--- src/wp-includes/pomo/translations.php
+++ src/wp-includes/pomo/translations.php
@@ -7,8 +7,8 @@
  * @subpackage translations
  */
 
-require_once dirname( __FILE__ ) . '/plural-forms.php';
-require_once dirname( __FILE__ ) . '/entry.php';
+require_once __DIR__ . '/plural-forms.php';
+require_once __DIR__ . '/entry.php';
 
 if ( ! class_exists( 'Translations', false ) ) :
 	class Translations {
diff --git src/wp-includes/rss-functions.php src/wp-includes/rss-functions.php
index 07b0aefb81..40749db8bf 100644
--- src/wp-includes/rss-functions.php
+++ src/wp-includes/rss-functions.php
@@ -7,4 +7,4 @@
  */
 
 _deprecated_file( basename( __FILE__ ), '2.1.0', WPINC . '/rss.php' );
-require_once( ABSPATH . WPINC . '/rss.php' );
+require_once ABSPATH . WPINC . '/rss.php';
diff --git src/wp-includes/script-loader.php src/wp-includes/script-loader.php
index 0e6bf8ae3f..e4a695570a 100644
--- src/wp-includes/script-loader.php
+++ src/wp-includes/script-loader.php
@@ -17,22 +17,22 @@
  */
 
 /** WordPress Dependency Class */
-require( ABSPATH . WPINC . '/class-wp-dependency.php' );
+require ABSPATH . WPINC . '/class-wp-dependency.php';
 
 /** WordPress Dependencies Class */
-require( ABSPATH . WPINC . '/class.wp-dependencies.php' );
+require ABSPATH . WPINC . '/class.wp-dependencies.php';
 
 /** WordPress Scripts Class */
-require( ABSPATH . WPINC . '/class.wp-scripts.php' );
+require ABSPATH . WPINC . '/class.wp-scripts.php';
 
 /** WordPress Scripts Functions */
-require( ABSPATH . WPINC . '/functions.wp-scripts.php' );
+require ABSPATH . WPINC . '/functions.wp-scripts.php';
 
 /** WordPress Styles Class */
-require( ABSPATH . WPINC . '/class.wp-styles.php' );
+require ABSPATH . WPINC . '/class.wp-styles.php';
 
 /** WordPress Styles Functions */
-require( ABSPATH . WPINC . '/functions.wp-styles.php' );
+require ABSPATH . WPINC . '/functions.wp-styles.php';
 
 /**
  * Registers TinyMCE scripts.
@@ -592,7 +592,7 @@ function wp_scripts_get_suffix( $type = '' ) {
 	static $suffixes;
 
 	if ( $suffixes === null ) {
-		include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
+		include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 
 		$develop_src = false !== strpos( $wp_version, '-src' );
 
@@ -1661,7 +1661,7 @@ function wp_default_scripts( &$scripts ) {
  * @param WP_Styles $styles
  */
 function wp_default_styles( &$styles ) {
-	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
+	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 
 	if ( ! defined( 'SCRIPT_DEBUG' ) ) {
 		define( 'SCRIPT_DEBUG', false !== strpos( $wp_version, '-src' ) );
@@ -2037,7 +2037,7 @@ function wp_localize_community_events() {
 		return;
 	}
 
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-community-events.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-community-events.php';
 
 	$user_id            = get_current_user_id();
 	$saved_location     = get_user_option( 'community-events-location', $user_id );
diff --git src/wp-includes/session.php src/wp-includes/session.php
index 8e9918ad4c..df2a042ca6 100644
--- src/wp-includes/session.php
+++ src/wp-includes/session.php
@@ -8,5 +8,5 @@
 
 _deprecated_file( basename( __FILE__ ), '4.7.0' );
 
-require_once( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
-require_once( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
+require_once ABSPATH . WPINC . '/class-wp-session-tokens.php';
+require_once ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php';
diff --git src/wp-includes/template-loader.php src/wp-includes/template-loader.php
index 8aa1ebeb67..b333c362f3 100644
--- src/wp-includes/template-loader.php
+++ src/wp-includes/template-loader.php
@@ -48,7 +48,7 @@ if ( is_robots() ) {
 	do_feed();
 	return;
 } elseif ( is_trackback() ) {
-	include( ABSPATH . 'wp-trackback.php' );
+	include ABSPATH . 'wp-trackback.php';
 	return;
 }
 
@@ -103,7 +103,7 @@ if ( wp_using_themes() ) {
 	 */
 	$template = apply_filters( 'template_include', $template );
 	if ( $template ) {
-		include( $template );
+		include $template;
 	} elseif ( current_user_can( 'switch_themes' ) ) {
 		$theme = wp_get_theme();
 		if ( $theme->errors() ) {
diff --git src/wp-includes/template.php src/wp-includes/template.php
index cd94f1ded3..d6566467f3 100644
--- src/wp-includes/template.php
+++ src/wp-includes/template.php
@@ -719,8 +719,8 @@ function load_template( $_template_file, $require_once = true ) {
 	}
 
 	if ( $require_once ) {
-		require_once( $_template_file );
+		require_once $_template_file;
 	} else {
-		require( $_template_file );
+		require $_template_file;
 	}
 }
diff --git src/wp-includes/theme.php src/wp-includes/theme.php
index 2cf95313a5..b96517a666 100644
--- src/wp-includes/theme.php
+++ src/wp-includes/theme.php
@@ -2633,7 +2633,7 @@ function _custom_header_background_just_in_time() {
 		}
 
 		if ( is_admin() ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-custom-image-header.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
 			$custom_image_header = new Custom_Image_Header( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
 		}
 	}
@@ -2646,7 +2646,7 @@ function _custom_header_background_just_in_time() {
 		add_action( 'wp_head', $args[0]['wp-head-callback'] );
 
 		if ( is_admin() ) {
-			require_once( ABSPATH . 'wp-admin/includes/class-custom-background.php' );
+			require_once ABSPATH . 'wp-admin/includes/class-custom-background.php';
 			$custom_background = new Custom_Background( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
 		}
 	}
@@ -2889,7 +2889,7 @@ function current_theme_supports( $feature, ...$args ) {
  */
 function require_if_theme_supports( $feature, $include ) {
 	if ( current_theme_supports( $feature ) ) {
-		require( $include );
+		require $include;
 		return true;
 	}
 	return false;
diff --git src/wp-includes/update.php src/wp-includes/update.php
index dfb27b2aad..22047e53a9 100644
--- src/wp-includes/update.php
+++ src/wp-includes/update.php
@@ -28,7 +28,7 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
 
 	global $wpdb, $wp_local_package;
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 	$php_version = phpversion();
 
 	$current      = get_site_transient( 'update_core' );
@@ -261,11 +261,11 @@ function wp_update_plugins( $extra_stats = array() ) {
 	}
 
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	// If running blog-side, bail unless we've not checked in the last 12 hours
 	if ( ! function_exists( 'get_plugins' ) ) {
-		require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
+		require_once ABSPATH . 'wp-admin/includes/plugin.php';
 	}
 
 	$plugins      = get_plugins();
@@ -441,7 +441,7 @@ function wp_update_themes( $extra_stats = array() ) {
 	}
 
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	$installed_themes = wp_get_themes();
 	$translations     = wp_get_installed_translations( 'themes' );
@@ -603,8 +603,8 @@ function wp_update_themes( $extra_stats = array() ) {
  * @since 3.7.0
  */
 function wp_maybe_auto_update() {
-	include_once( ABSPATH . 'wp-admin/includes/admin.php' );
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
+	include_once ABSPATH . 'wp-admin/includes/admin.php';
+	include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
 
 	$upgrader = new WP_Automatic_Updater;
 	$upgrader->run();
@@ -729,7 +729,7 @@ function wp_get_update_data() {
  */
 function _maybe_update_core() {
 	// include an unmodified $wp_version
-	include( ABSPATH . WPINC . '/version.php' );
+	include ABSPATH . WPINC . '/version.php';
 
 	$current = get_site_transient( 'update_core' );
 
diff --git src/wp-includes/widgets/class-wp-widget-text.php src/wp-includes/widgets/class-wp-widget-text.php
index 1c4ffa6bbe..dec49c8ccb 100644
--- src/wp-includes/widgets/class-wp-widget-text.php
+++ src/wp-includes/widgets/class-wp-widget-text.php
@@ -418,7 +418,7 @@ class WP_Widget_Text extends WP_Widget {
 	 * @since 4.9.3
 	 */
 	public function enqueue_preview_scripts() {
-		require_once dirname( dirname( __FILE__ ) ) . '/media.php';
+		require_once dirname( __DIR__ ) . '/media.php';
 
 		wp_playlist_scripts( 'audio' );
 		wp_playlist_scripts( 'video' );
diff --git src/wp-includes/wp-db.php src/wp-includes/wp-db.php
index 7ea8d7f756..50bb5a8a1c 100644
--- src/wp-includes/wp-db.php
+++ src/wp-includes/wp-db.php
@@ -1679,7 +1679,7 @@ class wpdb {
 
 			// Load custom DB error template, if present.
 			if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
-				require_once( WP_CONTENT_DIR . '/db-error.php' );
+				require_once WP_CONTENT_DIR . '/db-error.php';
 				die();
 			}
 
diff --git src/wp-includes/wp-diff.php src/wp-includes/wp-diff.php
index deae25081d..235b04b4be 100644
--- src/wp-includes/wp-diff.php
+++ src/wp-includes/wp-diff.php
@@ -10,12 +10,12 @@
 
 if ( ! class_exists( 'Text_Diff', false ) ) {
 	/** Text_Diff class */
-	require( ABSPATH . WPINC . '/Text/Diff.php' );
+	require ABSPATH . WPINC . '/Text/Diff.php';
 	/** Text_Diff_Renderer class */
-	require( ABSPATH . WPINC . '/Text/Diff/Renderer.php' );
+	require ABSPATH . WPINC . '/Text/Diff/Renderer.php';
 	/** Text_Diff_Renderer_inline class */
-	require( ABSPATH . WPINC . '/Text/Diff/Renderer/inline.php' );
+	require ABSPATH . WPINC . '/Text/Diff/Renderer/inline.php';
 }
 
-require( ABSPATH . WPINC . '/class-wp-text-diff-renderer-table.php' );
-require( ABSPATH . WPINC . '/class-wp-text-diff-renderer-inline.php' );
+require ABSPATH . WPINC . '/class-wp-text-diff-renderer-table.php';
+require ABSPATH . WPINC . '/class-wp-text-diff-renderer-inline.php';
diff --git src/wp-links-opml.php src/wp-links-opml.php
index c5b1729aea..9739a9a767 100644
--- src/wp-links-opml.php
+++ src/wp-links-opml.php
@@ -12,7 +12,7 @@
  * @package WordPress
  */
 
-require_once( dirname( __FILE__ ) . '/wp-load.php' );
+require_once __DIR__ . '/wp-load.php';
 
 header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
 $link_cat = '';
diff --git src/wp-load.php src/wp-load.php
index 2b8830b580..d0a322bf60 100644
--- src/wp-load.php
+++ src/wp-load.php
@@ -18,7 +18,7 @@
 
 /** Define ABSPATH as this file's directory */
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( __FILE__ ) . '/' );
+	define( 'ABSPATH', __DIR__ . '/' );
 }
 
 error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
@@ -34,24 +34,24 @@ error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_W
 if ( file_exists( ABSPATH . 'wp-config.php' ) ) {
 
 	/** The config file resides in ABSPATH */
-	require_once( ABSPATH . 'wp-config.php' );
+	require_once ABSPATH . 'wp-config.php';
 
 } elseif ( @file_exists( dirname( ABSPATH ) . '/wp-config.php' ) && ! @file_exists( dirname( ABSPATH ) . '/wp-settings.php' ) ) {
 
 	/** The config file resides one level above ABSPATH but is not part of another installation */
-	require_once( dirname( ABSPATH ) . '/wp-config.php' );
+	require_once dirname( ABSPATH ) . '/wp-config.php';
 
 } else {
 
 	// A config file doesn't exist
 
 	define( 'WPINC', 'wp-includes' );
-	require_once( ABSPATH . WPINC . '/load.php' );
+	require_once ABSPATH . WPINC . '/load.php';
 
 	// Standardize $_SERVER variables across setups.
 	wp_fix_server_vars();
 
-	require_once( ABSPATH . WPINC . '/functions.php' );
+	require_once ABSPATH . WPINC . '/functions.php';
 
 	$path = wp_guess_url() . '/wp-admin/setup-config.php';
 
@@ -66,7 +66,7 @@ if ( file_exists( ABSPATH . 'wp-config.php' ) ) {
 	}
 
 	define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
-	require_once( ABSPATH . WPINC . '/version.php' );
+	require_once ABSPATH . WPINC . '/version.php';
 
 	wp_check_php_mysql_versions();
 	wp_load_translations_early();
diff --git src/wp-login.php src/wp-login.php
index db739eddad..023581f4c9 100644
--- src/wp-login.php
+++ src/wp-login.php
@@ -9,7 +9,7 @@
  */
 
 /** Make sure that the WordPress bootstrap has run before continuing. */
-require( dirname( __FILE__ ) . '/wp-load.php' );
+require __DIR__ . '/wp-load.php';
 
 // Redirect to HTTPS login if forced to use SSL.
 if ( force_ssl_admin() && ! is_ssl() ) {
diff --git src/wp-mail.php src/wp-mail.php
index 25d2e58bed..f561099ee9 100644
--- src/wp-mail.php
+++ src/wp-mail.php
@@ -8,7 +8,7 @@
  */
 
 /** Make sure that the WordPress bootstrap has run before continuing. */
-require( dirname( __FILE__ ) . '/wp-load.php' );
+require __DIR__ . '/wp-load.php';
 
 /** This filter is documented in wp-admin/options.php */
 if ( ! apply_filters( 'enable_post_by_email_configuration', true ) ) {
@@ -29,7 +29,7 @@ if ( 'mail.example.com' === $mailserver_url || empty( $mailserver_url ) ) {
 do_action( 'wp-mail.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 
 /** Get the POP3 class with which to access the mailbox. */
-require_once( ABSPATH . WPINC . '/class-pop3.php' );
+require_once ABSPATH . WPINC . '/class-pop3.php';
 
 /** Only check at this interval for new messages. */
 if ( ! defined( 'WP_MAIL_INTERVAL' ) ) {
diff --git src/wp-settings.php src/wp-settings.php
index cf4fffc6e7..9d06022392 100644
--- src/wp-settings.php
+++ src/wp-settings.php
@@ -21,23 +21,23 @@ define( 'WPINC', 'wp-includes' );
  * these values to be overridden if already set.
  */
 global $wp_version, $wp_db_version, $tinymce_version, $required_php_version, $required_mysql_version, $wp_local_package;
-require( ABSPATH . WPINC . '/version.php' );
-require( ABSPATH . WPINC . '/load.php' );
+require ABSPATH . WPINC . '/version.php';
+require ABSPATH . WPINC . '/load.php';
 
 // Check for the required PHP version and for the MySQL extension or a database drop-in.
 wp_check_php_mysql_versions();
 
 // Include files required for initialization.
-require( ABSPATH . WPINC . '/class-wp-paused-extensions-storage.php' );
-require( ABSPATH . WPINC . '/class-wp-fatal-error-handler.php' );
-require( ABSPATH . WPINC . '/class-wp-recovery-mode-cookie-service.php' );
-require( ABSPATH . WPINC . '/class-wp-recovery-mode-key-service.php' );
-require( ABSPATH . WPINC . '/class-wp-recovery-mode-link-service.php' );
-require( ABSPATH . WPINC . '/class-wp-recovery-mode-email-service.php' );
-require( ABSPATH . WPINC . '/class-wp-recovery-mode.php' );
-require( ABSPATH . WPINC . '/error-protection.php' );
-require( ABSPATH . WPINC . '/default-constants.php' );
-require_once( ABSPATH . WPINC . '/plugin.php' );
+require ABSPATH . WPINC . '/class-wp-paused-extensions-storage.php';
+require ABSPATH . WPINC . '/class-wp-fatal-error-handler.php';
+require ABSPATH . WPINC . '/class-wp-recovery-mode-cookie-service.php';
+require ABSPATH . WPINC . '/class-wp-recovery-mode-key-service.php';
+require ABSPATH . WPINC . '/class-wp-recovery-mode-link-service.php';
+require ABSPATH . WPINC . '/class-wp-recovery-mode-email-service.php';
+require ABSPATH . WPINC . '/class-wp-recovery-mode.php';
+require ABSPATH . WPINC . '/error-protection.php';
+require ABSPATH . WPINC . '/default-constants.php';
+require_once ABSPATH . WPINC . '/plugin.php';
 
 /**
  * If not already configured, `$blog_id` will default to 1 in a single site
@@ -85,7 +85,7 @@ wp_debug_mode();
  */
 if ( WP_CACHE && apply_filters( 'enable_loading_advanced_cache_dropin', true ) && file_exists( WP_CONTENT_DIR . '/advanced-cache.php' ) ) {
 	// For an advanced caching plugin to use. Uses a static drop-in because you would only want one.
-	include( WP_CONTENT_DIR . '/advanced-cache.php' );
+	include WP_CONTENT_DIR . '/advanced-cache.php';
 
 	// Re-initialize any hooks added manually by advanced-cache.php
 	if ( $wp_filter ) {
@@ -97,16 +97,16 @@ if ( WP_CACHE && apply_filters( 'enable_loading_advanced_cache_dropin', true ) &
 wp_set_lang_dir();
 
 // Load early WordPress files.
-require( ABSPATH . WPINC . '/compat.php' );
-require( ABSPATH . WPINC . '/class-wp-list-util.php' );
-require( ABSPATH . WPINC . '/formatting.php' );
-require( ABSPATH . WPINC . '/meta.php' );
-require( ABSPATH . WPINC . '/functions.php' );
-require( ABSPATH . WPINC . '/class-wp-meta-query.php' );
-require( ABSPATH . WPINC . '/class-wp-matchesmapregex.php' );
-require( ABSPATH . WPINC . '/class-wp.php' );
-require( ABSPATH . WPINC . '/class-wp-error.php' );
-require( ABSPATH . WPINC . '/pomo/mo.php' );
+require ABSPATH . WPINC . '/compat.php';
+require ABSPATH . WPINC . '/class-wp-list-util.php';
+require ABSPATH . WPINC . '/formatting.php';
+require ABSPATH . WPINC . '/meta.php';
+require ABSPATH . WPINC . '/functions.php';
+require ABSPATH . WPINC . '/class-wp-meta-query.php';
+require ABSPATH . WPINC . '/class-wp-matchesmapregex.php';
+require ABSPATH . WPINC . '/class-wp.php';
+require ABSPATH . WPINC . '/class-wp-error.php';
+require ABSPATH . WPINC . '/pomo/mo.php';
 
 // Include the wpdb class and, if present, a db.php database drop-in.
 global $wpdb;
@@ -120,14 +120,14 @@ wp_set_wpdb_vars();
 wp_start_object_cache();
 
 // Attach the default filters.
-require( ABSPATH . WPINC . '/default-filters.php' );
+require ABSPATH . WPINC . '/default-filters.php';
 
 // Initialize multisite if enabled.
 if ( is_multisite() ) {
-	require( ABSPATH . WPINC . '/class-wp-site-query.php' );
-	require( ABSPATH . WPINC . '/class-wp-network-query.php' );
-	require( ABSPATH . WPINC . '/ms-blogs.php' );
-	require( ABSPATH . WPINC . '/ms-settings.php' );
+	require ABSPATH . WPINC . '/class-wp-site-query.php';
+	require ABSPATH . WPINC . '/class-wp-network-query.php';
+	require ABSPATH . WPINC . '/ms-blogs.php';
+	require ABSPATH . WPINC . '/ms-settings.php';
 } elseif ( ! defined( 'MULTISITE' ) ) {
 	define( 'MULTISITE', false );
 }
@@ -140,141 +140,141 @@ if ( SHORTINIT ) {
 }
 
 // Load the L10n library.
-require_once( ABSPATH . WPINC . '/l10n.php' );
-require_once( ABSPATH . WPINC . '/class-wp-locale.php' );
-require_once( ABSPATH . WPINC . '/class-wp-locale-switcher.php' );
+require_once ABSPATH . WPINC . '/l10n.php';
+require_once ABSPATH . WPINC . '/class-wp-locale.php';
+require_once ABSPATH . WPINC . '/class-wp-locale-switcher.php';
 
 // Run the installer if WordPress is not installed.
 wp_not_installed();
 
 // Load most of WordPress.
-require( ABSPATH . WPINC . '/class-wp-walker.php' );
-require( ABSPATH . WPINC . '/class-wp-ajax-response.php' );
-require( ABSPATH . WPINC . '/capabilities.php' );
-require( ABSPATH . WPINC . '/class-wp-roles.php' );
-require( ABSPATH . WPINC . '/class-wp-role.php' );
-require( ABSPATH . WPINC . '/class-wp-user.php' );
-require( ABSPATH . WPINC . '/class-wp-query.php' );
-require( ABSPATH . WPINC . '/query.php' );
-require( ABSPATH . WPINC . '/class-wp-date-query.php' );
-require( ABSPATH . WPINC . '/theme.php' );
-require( ABSPATH . WPINC . '/class-wp-theme.php' );
-require( ABSPATH . WPINC . '/template.php' );
-require( ABSPATH . WPINC . '/class-wp-user-request.php' );
-require( ABSPATH . WPINC . '/user.php' );
-require( ABSPATH . WPINC . '/class-wp-user-query.php' );
-require( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
-require( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
-require( ABSPATH . WPINC . '/class-wp-metadata-lazyloader.php' );
-require( ABSPATH . WPINC . '/general-template.php' );
-require( ABSPATH . WPINC . '/link-template.php' );
-require( ABSPATH . WPINC . '/author-template.php' );
-require( ABSPATH . WPINC . '/post.php' );
-require( ABSPATH . WPINC . '/class-walker-page.php' );
-require( ABSPATH . WPINC . '/class-walker-page-dropdown.php' );
-require( ABSPATH . WPINC . '/class-wp-post-type.php' );
-require( ABSPATH . WPINC . '/class-wp-post.php' );
-require( ABSPATH . WPINC . '/post-template.php' );
-require( ABSPATH . WPINC . '/revision.php' );
-require( ABSPATH . WPINC . '/post-formats.php' );
-require( ABSPATH . WPINC . '/post-thumbnail-template.php' );
-require( ABSPATH . WPINC . '/category.php' );
-require( ABSPATH . WPINC . '/class-walker-category.php' );
-require( ABSPATH . WPINC . '/class-walker-category-dropdown.php' );
-require( ABSPATH . WPINC . '/category-template.php' );
-require( ABSPATH . WPINC . '/comment.php' );
-require( ABSPATH . WPINC . '/class-wp-comment.php' );
-require( ABSPATH . WPINC . '/class-wp-comment-query.php' );
-require( ABSPATH . WPINC . '/class-walker-comment.php' );
-require( ABSPATH . WPINC . '/comment-template.php' );
-require( ABSPATH . WPINC . '/rewrite.php' );
-require( ABSPATH . WPINC . '/class-wp-rewrite.php' );
-require( ABSPATH . WPINC . '/feed.php' );
-require( ABSPATH . WPINC . '/bookmark.php' );
-require( ABSPATH . WPINC . '/bookmark-template.php' );
-require( ABSPATH . WPINC . '/kses.php' );
-require( ABSPATH . WPINC . '/cron.php' );
-require( ABSPATH . WPINC . '/deprecated.php' );
-require( ABSPATH . WPINC . '/script-loader.php' );
-require( ABSPATH . WPINC . '/taxonomy.php' );
-require( ABSPATH . WPINC . '/class-wp-taxonomy.php' );
-require( ABSPATH . WPINC . '/class-wp-term.php' );
-require( ABSPATH . WPINC . '/class-wp-term-query.php' );
-require( ABSPATH . WPINC . '/class-wp-tax-query.php' );
-require( ABSPATH . WPINC . '/update.php' );
-require( ABSPATH . WPINC . '/canonical.php' );
-require( ABSPATH . WPINC . '/shortcodes.php' );
-require( ABSPATH . WPINC . '/embed.php' );
-require( ABSPATH . WPINC . '/class-wp-embed.php' );
-require( ABSPATH . WPINC . '/class-wp-oembed.php' );
-require( ABSPATH . WPINC . '/class-wp-oembed-controller.php' );
-require( ABSPATH . WPINC . '/media.php' );
-require( ABSPATH . WPINC . '/http.php' );
-require( ABSPATH . WPINC . '/class-http.php' );
-require( ABSPATH . WPINC . '/class-wp-http-streams.php' );
-require( ABSPATH . WPINC . '/class-wp-http-curl.php' );
-require( ABSPATH . WPINC . '/class-wp-http-proxy.php' );
-require( ABSPATH . WPINC . '/class-wp-http-cookie.php' );
-require( ABSPATH . WPINC . '/class-wp-http-encoding.php' );
-require( ABSPATH . WPINC . '/class-wp-http-response.php' );
-require( ABSPATH . WPINC . '/class-wp-http-requests-response.php' );
-require( ABSPATH . WPINC . '/class-wp-http-requests-hooks.php' );
-require( ABSPATH . WPINC . '/widgets.php' );
-require( ABSPATH . WPINC . '/class-wp-widget.php' );
-require( ABSPATH . WPINC . '/class-wp-widget-factory.php' );
-require( ABSPATH . WPINC . '/nav-menu.php' );
-require( ABSPATH . WPINC . '/nav-menu-template.php' );
-require( ABSPATH . WPINC . '/admin-bar.php' );
-require( ABSPATH . WPINC . '/rest-api.php' );
-require( ABSPATH . WPINC . '/rest-api/class-wp-rest-server.php' );
-require( ABSPATH . WPINC . '/rest-api/class-wp-rest-response.php' );
-require( ABSPATH . WPINC . '/rest-api/class-wp-rest-request.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-posts-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-attachments-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-types-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-statuses-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-revisions-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-autosaves-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-taxonomies-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-terms-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-users-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-comments-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-search-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-blocks-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-block-renderer-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-settings-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-themes-controller.php' );
-require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-meta-fields.php' );
-require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-comment-meta-fields.php' );
-require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-post-meta-fields.php' );
-require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-term-meta-fields.php' );
-require( ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-user-meta-fields.php' );
-require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-search-handler.php' );
-require( ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php' );
-require( ABSPATH . WPINC . '/class-wp-block-type.php' );
-require( ABSPATH . WPINC . '/class-wp-block-styles-registry.php' );
-require( ABSPATH . WPINC . '/class-wp-block-type-registry.php' );
-require( ABSPATH . WPINC . '/class-wp-block-parser.php' );
-require( ABSPATH . WPINC . '/blocks.php' );
-require( ABSPATH . WPINC . '/blocks/archives.php' );
-require( ABSPATH . WPINC . '/blocks/block.php' );
-require( ABSPATH . WPINC . '/blocks/calendar.php' );
-require( ABSPATH . WPINC . '/blocks/categories.php' );
-require( ABSPATH . WPINC . '/blocks/latest-comments.php' );
-require( ABSPATH . WPINC . '/blocks/latest-posts.php' );
-require( ABSPATH . WPINC . '/blocks/rss.php' );
-require( ABSPATH . WPINC . '/blocks/search.php' );
-require( ABSPATH . WPINC . '/blocks/shortcode.php' );
-require( ABSPATH . WPINC . '/blocks/tag-cloud.php' );
+require ABSPATH . WPINC . '/class-wp-walker.php';
+require ABSPATH . WPINC . '/class-wp-ajax-response.php';
+require ABSPATH . WPINC . '/capabilities.php';
+require ABSPATH . WPINC . '/class-wp-roles.php';
+require ABSPATH . WPINC . '/class-wp-role.php';
+require ABSPATH . WPINC . '/class-wp-user.php';
+require ABSPATH . WPINC . '/class-wp-query.php';
+require ABSPATH . WPINC . '/query.php';
+require ABSPATH . WPINC . '/class-wp-date-query.php';
+require ABSPATH . WPINC . '/theme.php';
+require ABSPATH . WPINC . '/class-wp-theme.php';
+require ABSPATH . WPINC . '/template.php';
+require ABSPATH . WPINC . '/class-wp-user-request.php';
+require ABSPATH . WPINC . '/user.php';
+require ABSPATH . WPINC . '/class-wp-user-query.php';
+require ABSPATH . WPINC . '/class-wp-session-tokens.php';
+require ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php';
+require ABSPATH . WPINC . '/class-wp-metadata-lazyloader.php';
+require ABSPATH . WPINC . '/general-template.php';
+require ABSPATH . WPINC . '/link-template.php';
+require ABSPATH . WPINC . '/author-template.php';
+require ABSPATH . WPINC . '/post.php';
+require ABSPATH . WPINC . '/class-walker-page.php';
+require ABSPATH . WPINC . '/class-walker-page-dropdown.php';
+require ABSPATH . WPINC . '/class-wp-post-type.php';
+require ABSPATH . WPINC . '/class-wp-post.php';
+require ABSPATH . WPINC . '/post-template.php';
+require ABSPATH . WPINC . '/revision.php';
+require ABSPATH . WPINC . '/post-formats.php';
+require ABSPATH . WPINC . '/post-thumbnail-template.php';
+require ABSPATH . WPINC . '/category.php';
+require ABSPATH . WPINC . '/class-walker-category.php';
+require ABSPATH . WPINC . '/class-walker-category-dropdown.php';
+require ABSPATH . WPINC . '/category-template.php';
+require ABSPATH . WPINC . '/comment.php';
+require ABSPATH . WPINC . '/class-wp-comment.php';
+require ABSPATH . WPINC . '/class-wp-comment-query.php';
+require ABSPATH . WPINC . '/class-walker-comment.php';
+require ABSPATH . WPINC . '/comment-template.php';
+require ABSPATH . WPINC . '/rewrite.php';
+require ABSPATH . WPINC . '/class-wp-rewrite.php';
+require ABSPATH . WPINC . '/feed.php';
+require ABSPATH . WPINC . '/bookmark.php';
+require ABSPATH . WPINC . '/bookmark-template.php';
+require ABSPATH . WPINC . '/kses.php';
+require ABSPATH . WPINC . '/cron.php';
+require ABSPATH . WPINC . '/deprecated.php';
+require ABSPATH . WPINC . '/script-loader.php';
+require ABSPATH . WPINC . '/taxonomy.php';
+require ABSPATH . WPINC . '/class-wp-taxonomy.php';
+require ABSPATH . WPINC . '/class-wp-term.php';
+require ABSPATH . WPINC . '/class-wp-term-query.php';
+require ABSPATH . WPINC . '/class-wp-tax-query.php';
+require ABSPATH . WPINC . '/update.php';
+require ABSPATH . WPINC . '/canonical.php';
+require ABSPATH . WPINC . '/shortcodes.php';
+require ABSPATH . WPINC . '/embed.php';
+require ABSPATH . WPINC . '/class-wp-embed.php';
+require ABSPATH . WPINC . '/class-wp-oembed.php';
+require ABSPATH . WPINC . '/class-wp-oembed-controller.php';
+require ABSPATH . WPINC . '/media.php';
+require ABSPATH . WPINC . '/http.php';
+require ABSPATH . WPINC . '/class-http.php';
+require ABSPATH . WPINC . '/class-wp-http-streams.php';
+require ABSPATH . WPINC . '/class-wp-http-curl.php';
+require ABSPATH . WPINC . '/class-wp-http-proxy.php';
+require ABSPATH . WPINC . '/class-wp-http-cookie.php';
+require ABSPATH . WPINC . '/class-wp-http-encoding.php';
+require ABSPATH . WPINC . '/class-wp-http-response.php';
+require ABSPATH . WPINC . '/class-wp-http-requests-response.php';
+require ABSPATH . WPINC . '/class-wp-http-requests-hooks.php';
+require ABSPATH . WPINC . '/widgets.php';
+require ABSPATH . WPINC . '/class-wp-widget.php';
+require ABSPATH . WPINC . '/class-wp-widget-factory.php';
+require ABSPATH . WPINC . '/nav-menu.php';
+require ABSPATH . WPINC . '/nav-menu-template.php';
+require ABSPATH . WPINC . '/admin-bar.php';
+require ABSPATH . WPINC . '/rest-api.php';
+require ABSPATH . WPINC . '/rest-api/class-wp-rest-server.php';
+require ABSPATH . WPINC . '/rest-api/class-wp-rest-response.php';
+require ABSPATH . WPINC . '/rest-api/class-wp-rest-request.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-posts-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-attachments-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-types-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-post-statuses-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-revisions-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-autosaves-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-taxonomies-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-terms-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-users-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-comments-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-search-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-blocks-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-block-renderer-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-settings-controller.php';
+require ABSPATH . WPINC . '/rest-api/endpoints/class-wp-rest-themes-controller.php';
+require ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-meta-fields.php';
+require ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-comment-meta-fields.php';
+require ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-post-meta-fields.php';
+require ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-term-meta-fields.php';
+require ABSPATH . WPINC . '/rest-api/fields/class-wp-rest-user-meta-fields.php';
+require ABSPATH . WPINC . '/rest-api/search/class-wp-rest-search-handler.php';
+require ABSPATH . WPINC . '/rest-api/search/class-wp-rest-post-search-handler.php';
+require ABSPATH . WPINC . '/class-wp-block-type.php';
+require ABSPATH . WPINC . '/class-wp-block-styles-registry.php';
+require ABSPATH . WPINC . '/class-wp-block-type-registry.php';
+require ABSPATH . WPINC . '/class-wp-block-parser.php';
+require ABSPATH . WPINC . '/blocks.php';
+require ABSPATH . WPINC . '/blocks/archives.php';
+require ABSPATH . WPINC . '/blocks/block.php';
+require ABSPATH . WPINC . '/blocks/calendar.php';
+require ABSPATH . WPINC . '/blocks/categories.php';
+require ABSPATH . WPINC . '/blocks/latest-comments.php';
+require ABSPATH . WPINC . '/blocks/latest-posts.php';
+require ABSPATH . WPINC . '/blocks/rss.php';
+require ABSPATH . WPINC . '/blocks/search.php';
+require ABSPATH . WPINC . '/blocks/shortcode.php';
+require ABSPATH . WPINC . '/blocks/tag-cloud.php';
 
 $GLOBALS['wp_embed'] = new WP_Embed();
 
 // Load multisite-specific files.
 if ( is_multisite() ) {
-	require( ABSPATH . WPINC . '/ms-functions.php' );
-	require( ABSPATH . WPINC . '/ms-default-filters.php' );
-	require( ABSPATH . WPINC . '/ms-deprecated.php' );
+	require ABSPATH . WPINC . '/ms-functions.php';
+	require ABSPATH . WPINC . '/ms-default-filters.php';
+	require ABSPATH . WPINC . '/ms-deprecated.php';
 }
 
 // Define constants that rely on the API to obtain the default value.
@@ -285,7 +285,7 @@ $GLOBALS['wp_plugin_paths'] = array();
 
 // Load must-use plugins.
 foreach ( wp_get_mu_plugins() as $mu_plugin ) {
-	include_once( $mu_plugin );
+	include_once $mu_plugin;
 
 	/**
 	 * Fires once a single must-use plugin has loaded.
@@ -302,7 +302,7 @@ unset( $mu_plugin );
 if ( is_multisite() ) {
 	foreach ( wp_get_active_network_plugins() as $network_plugin ) {
 		wp_register_plugin_realpath( $network_plugin );
-		include_once( $network_plugin );
+		include_once $network_plugin;
 
 		/**
 		 * Fires once a single network-activated plugin has loaded.
@@ -334,7 +334,7 @@ wp_cookie_constants();
 wp_ssl_constants();
 
 // Create common globals.
-require( ABSPATH . WPINC . '/vars.php' );
+require ABSPATH . WPINC . '/vars.php';
 
 // Make taxonomies and posts available to plugins and themes.
 // @plugin authors: warning: these get registered again on the init hook.
@@ -353,14 +353,14 @@ if ( ! is_multisite() ) {
 
 // Create an instance of WP_Site_Health so that Cron events may fire.
 if ( ! class_exists( 'WP_Site_Health' ) ) {
-	require_once( ABSPATH . 'wp-admin/includes/class-wp-site-health.php' );
+	require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
 }
 WP_Site_Health::initialize();
 
 // Load active plugins.
 foreach ( wp_get_active_and_valid_plugins() as $plugin ) {
 	wp_register_plugin_realpath( $plugin );
-	include_once( $plugin );
+	include_once $plugin;
 
 	/**
 	 * Fires once a single activated plugin has loaded.
@@ -374,8 +374,8 @@ foreach ( wp_get_active_and_valid_plugins() as $plugin ) {
 unset( $plugin );
 
 // Load pluggable functions.
-require( ABSPATH . WPINC . '/pluggable.php' );
-require( ABSPATH . WPINC . '/pluggable-deprecated.php' );
+require ABSPATH . WPINC . '/pluggable.php';
+require ABSPATH . WPINC . '/pluggable-deprecated.php';
 
 // Set internal encoding.
 wp_set_internal_encoding();
@@ -472,7 +472,7 @@ load_default_textdomain();
 $locale      = get_locale();
 $locale_file = WP_LANG_DIR . "/$locale.php";
 if ( ( 0 === validate_file( $locale ) ) && is_readable( $locale_file ) ) {
-	require( $locale_file );
+	require $locale_file;
 }
 unset( $locale_file );
 
@@ -529,7 +529,7 @@ do_action( 'init' );
 if ( is_multisite() ) {
 	$file = ms_site_check();
 	if ( true !== $file ) {
-		require( $file );
+		require $file;
 		die();
 	}
 	unset( $file );
diff --git src/wp-signup.php src/wp-signup.php
index 0c50e98880..b5a2ca278a 100644
--- src/wp-signup.php
+++ src/wp-signup.php
@@ -1,11 +1,11 @@
 <?php
 
 /** Sets up the WordPress Environment. */
-require( dirname( __FILE__ ) . '/wp-load.php' );
+require __DIR__ . '/wp-load.php';
 
 add_action( 'wp_head', 'wp_no_robots' );
 
-require( dirname( __FILE__ ) . '/wp-blog-header.php' );
+require __DIR__ . '/wp-blog-header.php';
 
 nocache_headers();
 
diff --git src/wp-trackback.php src/wp-trackback.php
index f12b11658e..9d798b7167 100644
--- src/wp-trackback.php
+++ src/wp-trackback.php
@@ -9,7 +9,7 @@
  */
 
 if ( empty( $wp ) ) {
-	require_once( dirname( __FILE__ ) . '/wp-load.php' );
+	require_once __DIR__ . '/wp-load.php';
 	wp( array( 'tb' => '1' ) );
 }
 
diff --git src/xmlrpc.php src/xmlrpc.php
index b36b21e951..8e7b909311 100644
--- src/xmlrpc.php
+++ src/xmlrpc.php
@@ -27,7 +27,7 @@ if ( isset( $HTTP_RAW_POST_DATA ) ) {
 }
 
 /** Include the bootstrap for setting up WordPress environment */
-include( dirname( __FILE__ ) . '/wp-load.php' );
+include __DIR__ . '/wp-load.php';
 
 if ( isset( $_GET['rsd'] ) ) { // http://cyber.law.harvard.edu/blogs/gems/tech/rsd.html
 	header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
@@ -60,9 +60,9 @@ if ( isset( $_GET['rsd'] ) ) { // http://cyber.law.harvard.edu/blogs/gems/tech/r
 	exit;
 }
 
-include_once( ABSPATH . 'wp-admin/includes/admin.php' );
-include_once( ABSPATH . WPINC . '/class-IXR.php' );
-include_once( ABSPATH . WPINC . '/class-wp-xmlrpc-server.php' );
+include_once ABSPATH . 'wp-admin/includes/admin.php';
+include_once ABSPATH . WPINC . '/class-IXR.php';
+include_once ABSPATH . WPINC . '/class-wp-xmlrpc-server.php';
 
 /**
  * Posts submitted via the XML-RPC interface get that title
diff --git tests/phpunit/data/themedir1/camelCase/index.php tests/phpunit/data/themedir1/camelCase/index.php
index 93de08260b..2f83cff6bd 100644
--- tests/phpunit/data/themedir1/camelCase/index.php
+++ tests/phpunit/data/themedir1/camelCase/index.php
@@ -2,4 +2,4 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
diff --git tests/phpunit/data/themedir1/sandbox/functions.php tests/phpunit/data/themedir1/sandbox/functions.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/sandbox/functions.php
+++ tests/phpunit/data/themedir1/sandbox/functions.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/data/themedir1/sandbox/index.php tests/phpunit/data/themedir1/sandbox/index.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/sandbox/index.php
+++ tests/phpunit/data/themedir1/sandbox/index.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/data/themedir1/theme1-dupe/functions.php tests/phpunit/data/themedir1/theme1-dupe/functions.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/theme1-dupe/functions.php
+++ tests/phpunit/data/themedir1/theme1-dupe/functions.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/data/themedir1/theme1-dupe/index.php tests/phpunit/data/themedir1/theme1-dupe/index.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/theme1-dupe/index.php
+++ tests/phpunit/data/themedir1/theme1-dupe/index.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/data/themedir1/theme1/functions.php tests/phpunit/data/themedir1/theme1/functions.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/theme1/functions.php
+++ tests/phpunit/data/themedir1/theme1/functions.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/data/themedir1/theme1/index.php tests/phpunit/data/themedir1/theme1/index.php
index 1c8413d3a1..d26884a98f 100644
--- tests/phpunit/data/themedir1/theme1/index.php
+++ tests/phpunit/data/themedir1/theme1/index.php
@@ -2,6 +2,6 @@
 
 // dummy theme
 
-echo dirname(__FILE__).'/'.basename(__FILE__);
+echo __DIR__ . '/' . basename(__FILE__);
 
 ?>
diff --git tests/phpunit/includes/abstract-testcase.php tests/phpunit/includes/abstract-testcase.php
index 75525d55d0..166897908f 100644
--- tests/phpunit/includes/abstract-testcase.php
+++ tests/phpunit/includes/abstract-testcase.php
@@ -1,7 +1,7 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/factory.php';
-require_once dirname( __FILE__ ) . '/trac.php';
+require_once __DIR__ . '/factory.php';
+require_once __DIR__ . '/trac.php';
 
 /**
  * Defines a basic fixture to run multiple tests.
diff --git tests/phpunit/includes/bootstrap.php tests/phpunit/includes/bootstrap.php
index 97003ae7ff..1e41420257 100644
--- tests/phpunit/includes/bootstrap.php
+++ tests/phpunit/includes/bootstrap.php
@@ -7,13 +7,13 @@
  * Compatibility with PHPUnit 6+
  */
 if ( class_exists( 'PHPUnit\Runner\Version' ) ) {
-	require_once dirname( __FILE__ ) . '/phpunit6/compat.php';
+	require_once __DIR__ . '/phpunit6/compat.php';
 }
 
 if ( defined( 'WP_TESTS_CONFIG_FILE_PATH' ) ) {
 	$config_file_path = WP_TESTS_CONFIG_FILE_PATH;
 } else {
-	$config_file_path = dirname( dirname( __FILE__ ) );
+	$config_file_path = dirname( __DIR__ );
 	if ( ! file_exists( $config_file_path . '/wp-tests-config.php' ) ) {
 		// Support the config file from the root of the develop repository.
 		if ( basename( $config_file_path ) === 'phpunit' && basename( dirname( $config_file_path ) ) === 'tests' ) {
@@ -35,7 +35,7 @@ if ( ! is_readable( $config_file_path ) ) {
 }
 
 require_once $config_file_path;
-require_once dirname( __FILE__ ) . '/functions.php';
+require_once __DIR__ . '/functions.php';
 
 if ( version_compare( tests_get_phpunit_version(), '8.0', '>=' ) ) {
 	printf(
@@ -54,8 +54,8 @@ if ( defined( 'WP_RUN_CORE_TESTS' ) && WP_RUN_CORE_TESTS && ! is_dir( ABSPATH )
 tests_reset__SERVER();
 
 define( 'WP_TESTS_TABLE_PREFIX', $table_prefix );
-define( 'DIR_TESTDATA', dirname( __FILE__ ) . '/../data' );
-define( 'DIR_TESTROOT', realpath( dirname( dirname( __FILE__ ) ) ) );
+define( 'DIR_TESTDATA', __DIR__ . '/../data' );
+define( 'DIR_TESTROOT', realpath( dirname( __DIR__ ) ) );
 
 define( 'WP_LANG_DIR', DIR_TESTDATA . '/languages' );
 
@@ -84,7 +84,7 @@ $multisite = $multisite || ( defined( 'WP_TESTS_MULTISITE' ) && WP_TESTS_MULTISI
 $multisite = $multisite || ( defined( 'MULTISITE' ) && MULTISITE );
 
 // Override the PHPMailer
-require_once( dirname( __FILE__ ) . '/mock-mailer.php' );
+require_once( __DIR__ . '/mock-mailer.php' );
 $phpmailer = new MockPHPMailer( true );
 
 if ( ! defined( 'WP_DEFAULT_THEME' ) ) {
@@ -97,7 +97,7 @@ if ( file_exists( DIR_TESTDATA . '/themedir1' ) ) {
 }
 
 if ( '1' !== getenv( 'WP_TESTS_SKIP_INSTALL' ) ) {
-	system( WP_PHP_BINARY . ' ' . escapeshellarg( dirname( __FILE__ ) . '/install.php' ) . ' ' . escapeshellarg( $config_file_path ) . ' ' . $multisite, $retval );
+	system( WP_PHP_BINARY . ' ' . escapeshellarg( __DIR__ . '/install.php' ) . ' ' . escapeshellarg( $config_file_path ) . ' ' . $multisite, $retval );
 	if ( 0 !== $retval ) {
 		exit( $retval );
 	}
@@ -139,22 +139,22 @@ require_once ABSPATH . '/wp-settings.php';
 _delete_all_posts();
 
 if ( version_compare( tests_get_phpunit_version(), '7.0', '>=' ) ) {
-	require dirname( __FILE__ ) . '/phpunit7/testcase.php';
+	require __DIR__ . '/phpunit7/testcase.php';
 } else {
-	require dirname( __FILE__ ) . '/testcase.php';
+	require __DIR__ . '/testcase.php';
 }
 
-require dirname( __FILE__ ) . '/testcase-rest-api.php';
-require dirname( __FILE__ ) . '/testcase-rest-controller.php';
-require dirname( __FILE__ ) . '/testcase-rest-post-type-controller.php';
-require dirname( __FILE__ ) . '/testcase-xmlrpc.php';
-require dirname( __FILE__ ) . '/testcase-ajax.php';
-require dirname( __FILE__ ) . '/testcase-canonical.php';
-require dirname( __FILE__ ) . '/exceptions.php';
-require dirname( __FILE__ ) . '/utils.php';
-require dirname( __FILE__ ) . '/spy-rest-server.php';
-require dirname( __FILE__ ) . '/class-wp-rest-test-search-handler.php';
-require dirname( __FILE__ ) . '/class-wp-fake-block-type.php';
+require __DIR__ . '/testcase-rest-api.php';
+require __DIR__ . '/testcase-rest-controller.php';
+require __DIR__ . '/testcase-rest-post-type-controller.php';
+require __DIR__ . '/testcase-xmlrpc.php';
+require __DIR__ . '/testcase-ajax.php';
+require __DIR__ . '/testcase-canonical.php';
+require __DIR__ . '/exceptions.php';
+require __DIR__ . '/utils.php';
+require __DIR__ . '/spy-rest-server.php';
+require __DIR__ . '/class-wp-rest-test-search-handler.php';
+require __DIR__ . '/class-wp-fake-block-type.php';
 
 /**
  * A class to handle additional command line arguments passed to the script.
diff --git tests/phpunit/includes/factory.php tests/phpunit/includes/factory.php
index 91d7da750e..7c98853219 100644
--- tests/phpunit/includes/factory.php
+++ tests/phpunit/includes/factory.php
@@ -1,14 +1,14 @@
 <?php
 
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-thing.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-post.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-bookmark.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-attachment.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-user.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-comment.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-blog.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-network.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-for-term.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-generator-sequence.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory-callback-after-create.php' );
-require_once( dirname( __FILE__ ) . '/factory/class-wp-unittest-factory.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-thing.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-post.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-bookmark.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-attachment.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-user.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-comment.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-blog.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-network.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-for-term.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-generator-sequence.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory-callback-after-create.php' );
+require_once( __DIR__ . '/factory/class-wp-unittest-factory.php' );
diff --git tests/phpunit/includes/install.php tests/phpunit/includes/install.php
index d07079e501..d493d343ef 100644
--- tests/phpunit/includes/install.php
+++ tests/phpunit/includes/install.php
@@ -11,7 +11,7 @@ $multisite        = ! empty( $argv[2] );
 
 define( 'WP_INSTALLING', true );
 require_once $config_file_path;
-require_once dirname( __FILE__ ) . '/functions.php';
+require_once __DIR__ . '/functions.php';
 
 // Set the theme to our special empty theme, to avoid interference from the current Twenty* theme.
 if ( ! defined( 'WP_DEFAULT_THEME' ) ) {
@@ -33,10 +33,10 @@ require_once ABSPATH . '/wp-includes/wp-db.php';
 
 // Override the PHPMailer
 global $phpmailer;
-require_once( dirname( __FILE__ ) . '/mock-mailer.php' );
+require_once( __DIR__ . '/mock-mailer.php' );
 $phpmailer = new MockPHPMailer();
 
-register_theme_directory( dirname( __FILE__ ) . '/../data/themedir1' );
+register_theme_directory( __DIR__ . '/../data/themedir1' );
 
 /*
  * default_storage_engine and storage_engine are the same option, but storage_engine
diff --git tests/phpunit/includes/listener-loader.php tests/phpunit/includes/listener-loader.php
index 3e3731f98b..1f86fefc06 100644
--- tests/phpunit/includes/listener-loader.php
+++ tests/phpunit/includes/listener-loader.php
@@ -1,7 +1,7 @@
 <?php
 
 if ( version_compare( tests_get_phpunit_version(), '7.0', '>=' ) ) {
-	require dirname( __FILE__ ) . '/phpunit7/speed-trap-listener.php';
+	require __DIR__ . '/phpunit7/speed-trap-listener.php';
 } else {
-	require dirname( __FILE__ ) . '/speed-trap-listener.php';
+	require __DIR__ . '/speed-trap-listener.php';
 }
diff --git tests/phpunit/includes/phpunit7/testcase.php tests/phpunit/includes/phpunit7/testcase.php
index 9edc885e6a..84fe88fe3e 100644
--- tests/phpunit/includes/phpunit7/testcase.php
+++ tests/phpunit/includes/phpunit7/testcase.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( dirname( __FILE__ ) ) . '/abstract-testcase.php';
+require_once dirname( __DIR__ ) . '/abstract-testcase.php';
 
 /**
  * Defines a basic fixture to run multiple tests.
diff --git tests/phpunit/includes/testcase.php tests/phpunit/includes/testcase.php
index 964af64ca3..7689d0e48c 100644
--- tests/phpunit/includes/testcase.php
+++ tests/phpunit/includes/testcase.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/abstract-testcase.php';
+require_once __DIR__ . '/abstract-testcase.php';
 
 /**
  * Defines a basic fixture to run multiple tests.
diff --git tests/phpunit/tests/canonical/noRewrite.php tests/phpunit/tests/canonical/noRewrite.php
index 0c2a027cfc..e83290aa6a 100644
--- tests/phpunit/tests/canonical/noRewrite.php
+++ tests/phpunit/tests/canonical/noRewrite.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( dirname( __FILE__ ) ) . '/canonical.php';
+require_once dirname( __DIR__ ) . '/canonical.php';
 
 /**
  * @group canonical
diff --git tests/phpunit/tests/db/charset.php tests/phpunit/tests/db/charset.php
index dc7f7c3b8f..db11933e95 100644
--- tests/phpunit/tests/db/charset.php
+++ tests/phpunit/tests/db/charset.php
@@ -25,7 +25,7 @@ class Tests_DB_Charset extends WP_UnitTestCase {
 	public static function setUpBeforeClass() {
 		parent::setUpBeforeClass();
 
-		require_once( dirname( dirname( __FILE__ ) ) . '/db.php' );
+		require_once( dirname( __DIR__ ) . '/db.php' );
 
 		self::$_wpdb = new WpdbExposedMethodsForTesting();
 
diff --git tests/phpunit/tests/filesystem/base.php tests/phpunit/tests/filesystem/base.php
index 356be3c9e0..fc0d9f8193 100644
--- tests/phpunit/tests/filesystem/base.php
+++ tests/phpunit/tests/filesystem/base.php
@@ -24,7 +24,7 @@ abstract class WP_Filesystem_UnitTestCase extends WP_UnitTestCase {
 		return 'MockFS';
 	}
 	function filter_abstraction_file( $file ) {
-		return dirname( dirname( dirname( __FILE__ ) ) ) . '/includes/mock-fs.php';
+		return dirname( dirname( __DIR__ ) ) . '/includes/mock-fs.php';
 	}
 
 	function test_is_MockFS_sane() {
diff --git tests/phpunit/tests/filesystem/findFolder.php tests/phpunit/tests/filesystem/findFolder.php
index 9f754a7c55..903c6af9b7 100644
--- tests/phpunit/tests/filesystem/findFolder.php
+++ tests/phpunit/tests/filesystem/findFolder.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group filesystem
diff --git tests/phpunit/tests/http/curl.php tests/phpunit/tests/http/curl.php
index f64cace2b7..271e6dd698 100644
--- tests/phpunit/tests/http/curl.php
+++ tests/phpunit/tests/http/curl.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group http
diff --git tests/phpunit/tests/http/streams.php tests/phpunit/tests/http/streams.php
index 2c6922f901..61fcc11925 100644
--- tests/phpunit/tests/http/streams.php
+++ tests/phpunit/tests/http/streams.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group http
diff --git tests/phpunit/tests/image/editor.php tests/phpunit/tests/image/editor.php
index 35242ad3e0..888d9dc1f4 100644
--- tests/phpunit/tests/image/editor.php
+++ tests/phpunit/tests/image/editor.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * Test the WP_Image_Editor base class
diff --git tests/phpunit/tests/image/editorGd.php tests/phpunit/tests/image/editorGd.php
index fdd0e9c96a..5bbe4d2478 100644
--- tests/phpunit/tests/image/editorGd.php
+++ tests/phpunit/tests/image/editorGd.php
@@ -7,7 +7,7 @@
  * @group media
  * @group wp-image-editor-gd
  */
-require_once( dirname( __FILE__ ) . '/base.php' );
+require_once( __DIR__ . '/base.php' );
 
 class Tests_Image_Editor_GD extends WP_Image_UnitTestCase {
 
diff --git tests/phpunit/tests/image/editorImagick.php tests/phpunit/tests/image/editorImagick.php
index ac531ff942..e8ff8ecc9a 100644
--- tests/phpunit/tests/image/editorImagick.php
+++ tests/phpunit/tests/image/editorImagick.php
@@ -7,7 +7,7 @@
  * @group media
  * @group wp-image-editor-imagick
  */
-require_once( dirname( __FILE__ ) . '/base.php' );
+require_once( __DIR__ . '/base.php' );
 
 class Tests_Image_Editor_Imagick extends WP_Image_UnitTestCase {
 
diff --git tests/phpunit/tests/image/resize.php tests/phpunit/tests/image/resize.php
index 2cbd5a2505..2df3b3c25c 100644
--- tests/phpunit/tests/image/resize.php
+++ tests/phpunit/tests/image/resize.php
@@ -6,7 +6,7 @@
  * @group upload
  * @group resize
  */
-require_once( dirname( __FILE__ ) . '/base.php' );
+require_once( __DIR__ . '/base.php' );
 
 abstract class WP_Tests_Image_Resize_UnitTestCase extends WP_Image_UnitTestCase {
 
diff --git tests/phpunit/tests/image/resizeGd.php tests/phpunit/tests/image/resizeGd.php
index 5d1c614c34..37a2282ca6 100644
--- tests/phpunit/tests/image/resizeGd.php
+++ tests/phpunit/tests/image/resizeGd.php
@@ -6,7 +6,7 @@
  * @group upload
  * @group resize
  */
-require_once( dirname( __FILE__ ) . '/resize.php' );
+require_once( __DIR__ . '/resize.php' );
 
 class Test_Image_Resize_GD extends WP_Tests_Image_Resize_UnitTestCase {
 
diff --git tests/phpunit/tests/image/resizeImagick.php tests/phpunit/tests/image/resizeImagick.php
index d611e38e14..dd424be2bd 100644
--- tests/phpunit/tests/image/resizeImagick.php
+++ tests/phpunit/tests/image/resizeImagick.php
@@ -6,7 +6,7 @@
  * @group upload
  * @group resize
  */
-require_once( dirname( __FILE__ ) . '/resize.php' );
+require_once( __DIR__ . '/resize.php' );
 
 class Test_Image_Resize_Imagick extends WP_Tests_Image_Resize_UnitTestCase {
 
diff --git tests/phpunit/tests/import/import.php tests/phpunit/tests/import/import.php
index e005826a18..88dee19985 100644
--- tests/phpunit/tests/import/import.php
+++ tests/phpunit/tests/import/import.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group import
diff --git tests/phpunit/tests/import/parser.php tests/phpunit/tests/import/parser.php
index 8b198f31e4..be7b141d27 100644
--- tests/phpunit/tests/import/parser.php
+++ tests/phpunit/tests/import/parser.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group import
diff --git tests/phpunit/tests/import/postmeta.php tests/phpunit/tests/import/postmeta.php
index dcae22d0bd..e712531ea2 100644
--- tests/phpunit/tests/import/postmeta.php
+++ tests/phpunit/tests/import/postmeta.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/base.php';
+require_once __DIR__ . '/base.php';
 
 /**
  * @group import
diff --git tests/phpunit/tests/pomo/pluralForms.php tests/phpunit/tests/pomo/pluralForms.php
index 2cd283cf95..354a95e54e 100644
--- tests/phpunit/tests/pomo/pluralForms.php
+++ tests/phpunit/tests/pomo/pluralForms.php
@@ -78,7 +78,7 @@ class PluralFormsTest extends WP_UnitTestCase {
 			$this->markTestSkipped( 'Lambda functions are deprecated in PHP 7.2' );
 		}
 
-		require_once dirname( dirname( dirname( __FILE__ ) ) ) . '/includes/plural-form-function.php';
+		require_once dirname( dirname( __DIR__ ) ) . '/includes/plural-form-function.php';
 
 		$parenthesized = self::parenthesize_plural_expression( $expression );
 		$old_style     = tests_make_plural_form_function( $nplurals, $parenthesized );
diff --git tests/phpunit/tests/query/verboseRewriteRules.php tests/phpunit/tests/query/verboseRewriteRules.php
index 5414a51a9a..88f2ef38ac 100644
--- tests/phpunit/tests/query/verboseRewriteRules.php
+++ tests/phpunit/tests/query/verboseRewriteRules.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once dirname( __FILE__ ) . '/conditionals.php';
+require_once __DIR__ . '/conditionals.php';
 
 /**
  * @group query
diff --git tests/phpunit/wp-mail-real-test.php tests/phpunit/wp-mail-real-test.php
index 67da30ef86..8b6a77e50c 100644
--- tests/phpunit/wp-mail-real-test.php
+++ tests/phpunit/wp-mail-real-test.php
@@ -10,11 +10,11 @@ $options = 'v:r:d';
 if ( is_callable( 'getopt' ) ) {
 	$opts = getopt( $options );
 } else {
-	include( dirname( __FILE__ ) . '/wp-testlib/getopt.php' );
+	include( __DIR__ . '/wp-testlib/getopt.php' );
 	$opts = getoptParser::getopt( $options );
 }
 
-define( 'DIR_TESTROOT', realpath( dirname( __FILE__ ) ) );
+define( 'DIR_TESTROOT', realpath( __DIR__ ) );
 
 define( 'TEST_WP', true );
 define( 'WP_DEBUG', array_key_exists( 'd', $opts ) );
diff --git wp-config-sample.php wp-config-sample.php
index 1a4e59243b..f92134c3dc 100644
--- wp-config-sample.php
+++ wp-config-sample.php
@@ -83,7 +83,7 @@ define( 'WP_DEBUG', false );
 
 /** Absolute path to the WordPress directory. */
 if ( ! defined( 'ABSPATH' ) ) {
-	define( 'ABSPATH', dirname( __FILE__ ) . '/' );
+	define( 'ABSPATH', __DIR__ . '/' );
 }
 
 /** Sets up WordPress vars and included files. */
diff --git wp-tests-config-sample.php wp-tests-config-sample.php
index 2f6c515912..7a030d25fb 100644
--- wp-tests-config-sample.php
+++ wp-tests-config-sample.php
@@ -2,9 +2,9 @@
 
 /* Path to the WordPress codebase you'd like to test. Add a forward slash in the end. */
 if ( defined( 'WP_RUN_CORE_TESTS' ) && WP_RUN_CORE_TESTS ) {
-	define( 'ABSPATH', dirname( __FILE__ ) . '/build/' );
+	define( 'ABSPATH', __DIR__ . '/build/' );
 } else {
-	define( 'ABSPATH', dirname( __FILE__ ) . '/src/' );
+	define( 'ABSPATH', __DIR__ . '/src/' );
 }
 
 /*
