diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index b0b86166ad..67cc3f3347 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -254,7 +254,7 @@ $_old_files = array(
 	'wp-includes/js/jquery/interface.js',
 	'wp-includes/js/scriptaculous/prototype.js',
 	// Following file added back in 5.1 see #45645
-	//'wp-includes/js/tinymce/wp-tinymce.js',
+	// 'wp-includes/js/tinymce/wp-tinymce.js',
 	// 3.1
 	'wp-admin/edit-attachment-rows.php',
 	'wp-admin/edit-link-categories.php',
@@ -928,7 +928,7 @@ 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();
@@ -946,10 +946,19 @@ function update_core( $from, $to ) {
 		$wp_filesystem->delete( $from, true );
 	}
 
+	/* translators: %s: Update PHP page URL */
+	$php_update_message = '<br>' . sprintf( __( '<a href="%s">Learn more about updating PHP</a>.' ), esc_url( wp_get_update_php_url() ) );
+
+	$annotation = wp_get_update_php_annotation();
+
+	if ( $annotation ) {
+		$php_update_message .= '<br><em>' . $annotation . '</em>';
+	}
+
 	if ( ! $mysql_compat && ! $php_compat ) {
-		return new WP_Error( 'php_mysql_not_compatible', sprintf( __( 'The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.' ), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) );
+		return new WP_Error( 'php_mysql_not_compatible', sprintf( __( 'The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.' ), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) . $php_update_message );
 	} elseif ( ! $php_compat ) {
-		return new WP_Error( 'php_not_compatible', sprintf( __( 'The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.' ), $wp_version, $required_php_version, $php_version ) );
+		return new WP_Error( 'php_not_compatible', sprintf( __( 'The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.' ), $wp_version, $required_php_version, $php_version ) . $php_update_message );
 	} elseif ( ! $mysql_compat ) {
 		return new WP_Error( 'mysql_not_compatible', sprintf( __( 'The update cannot be installed because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.' ), $wp_version, $required_mysql_version, $mysql_version ) );
 	}
@@ -1165,7 +1174,7 @@ function update_core( $from, $to ) {
 					// If a error occurs partway through this final step, keep the error flowing through, but keep process going.
 					if ( is_wp_error( $_result ) ) {
 						if ( ! is_wp_error( $result ) ) {
-							$result = new WP_Error;
+							$result = new WP_Error();
 						}
 						$result->add( $_result->get_error_code() . "_$type", $_result->get_error_message(), substr( $_result->get_error_data(), strlen( $dest ) ) );
 					}
@@ -1253,7 +1262,7 @@ function update_core( $from, $to ) {
  *
  * @param string $from     source directory
  * @param string $to       destination directory
- * @param array $skip_list a list of files/folders to skip copying
+ * @param array  $skip_list a list of files/folders to skip copying
  * @return mixed WP_Error on failure, True on success.
  */
 function _copy_dir( $from, $to, $skip_list = array() ) {
@@ -1350,7 +1359,7 @@ 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 a/wp-admin/install.php b/wp-admin/install.php
index 4a38eab1cd..3c27fafb80 100644
--- a/wp-admin/install.php
+++ b/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( dirname( __FILE__ ) ) . '/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();
 
@@ -243,12 +243,21 @@ $version_url = sprintf(
 	sanitize_title( $wp_version )
 );
 
+/* translators: %s: Update PHP page URL */
+$php_update_message = '<br>' . sprintf( __( '<a href="%s">Learn more about updating PHP</a>.' ), esc_url( wp_get_update_php_url() ) );
+
+$annotation = wp_get_update_php_annotation();
+
+if ( $annotation ) {
+	$php_update_message .= '<br><em>' . $annotation . '</em>';
+}
+
 if ( ! $mysql_compat && ! $php_compat ) {
 	/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Minimum required MySQL version number, 5: Current PHP version number, 6: Current MySQL version number */
-	$compat = sprintf( __( 'You cannot install because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version );
+	$compat = sprintf( __( 'You cannot install because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) . $php_update_message;
 } elseif ( ! $php_compat ) {
 	/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Current PHP version number */
-	$compat = sprintf( __( 'You cannot install because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_php_version, $php_version );
+	$compat = sprintf( __( 'You cannot install because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_php_version, $php_version ) . $php_update_message;
 } elseif ( ! $mysql_compat ) {
 	/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required MySQL version number, 4: Current MySQL version number */
 	$compat = sprintf( __( 'You cannot install because <a href="%1$s">WordPress %2$s</a> requires MySQL version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_mysql_version, $mysql_version );
diff --git a/wp-admin/update-core.php b/wp-admin/update-core.php
index 570703e5d8..0d8dad303a 100644
--- a/wp-admin/update-core.php
+++ b/wp-admin/update-core.php
@@ -7,7 +7,7 @@
  */
 
 /** WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once dirname( __FILE__ ) . '/admin.php';
 
 wp_enqueue_style( 'plugin-install' );
 wp_enqueue_script( 'plugin-install' );
@@ -76,12 +76,21 @@ function list_core_update( $update ) {
 				sanitize_title( $update->current )
 			);
 
+			/* translators: %s: Update PHP page URL */
+			$php_update_message = '<br>' . sprintf( __( '<a href="%s">Learn more about updating PHP</a>.' ), esc_url( wp_get_update_php_url() ) );
+
+			$annotation = wp_get_update_php_annotation();
+
+			if ( $annotation ) {
+				$php_update_message .= '<br><em>' . $annotation . '</em>';
+			}
+
 			if ( ! $mysql_compat && ! $php_compat ) {
 				/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Minimum required MySQL version number, 5: Current PHP version number, 6: Current MySQL version number */
-				$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $update->current, $update->php_version, $update->mysql_version, $php_version, $mysql_version );
+				$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $update->current, $update->php_version, $update->mysql_version, $php_version, $mysql_version ) . $php_update_message;
 			} elseif ( ! $php_compat ) {
 				/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Current PHP version number */
-				$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $update->current, $update->php_version, $php_version );
+				$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $update->current, $update->php_version, $php_version ) . $php_update_message;
 			} elseif ( ! $mysql_compat ) {
 				/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required MySQL version number, 4: Current MySQL version number */
 				$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires MySQL version %3$s or higher. You are running version %4$s.' ), $version_url, $update->current, $update->mysql_version, $mysql_version );
@@ -183,7 +192,7 @@ function core_upgrade_preamble() {
 
 		if ( wp_http_supports( array( 'ssl' ) ) ) {
 			require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
-			$upgrader            = new WP_Automatic_Updater;
+			$upgrader            = new WP_Automatic_Updater();
 			$future_minor_update = (object) array(
 				'current'       => $wp_version . '.1.next.minor',
 				'version'       => $wp_version . '.1.next.minor',
@@ -208,7 +217,7 @@ function core_upgrade_preamble() {
 
 	if ( isset( $updates[0] ) && $updates[0]->response == 'development' ) {
 		require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
-		$upgrader = new WP_Automatic_Updater;
+		$upgrader = new WP_Automatic_Updater();
 		if ( wp_http_supports( 'ssl' ) && $upgrader->should_update( 'core', $updates[0], ABSPATH ) ) {
 			echo '<div class="updated inline"><p>';
 			echo '<strong>' . __( 'BETA TESTERS:' ) . '</strong> ' . __( 'This site is set up to install updates of future beta versions automatically.' );
@@ -237,7 +246,7 @@ 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>';
@@ -497,7 +506,7 @@ 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';
@@ -655,7 +664,7 @@ 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>
@@ -712,7 +721,7 @@ 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 ) {
 
@@ -729,7 +738,7 @@ 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 {
@@ -748,7 +757,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-plugin-upgrade' == $action ) {
 
@@ -772,7 +781,7 @@ 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>';
@@ -786,7 +795,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-theme-upgrade' == $action ) {
 
@@ -810,7 +819,7 @@ 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>
@@ -826,7 +835,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	include ABSPATH . 'wp-admin/admin-footer.php';
 
 } elseif ( 'do-translation-upgrade' == $action ) {
 
@@ -836,8 +845,8 @@ 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';
@@ -855,7 +864,7 @@ if ( 'upgrade-core' == $action ) {
 		)
 	);
 
-	require_once( ABSPATH . 'wp-admin/admin-footer.php' );
+	require_once ABSPATH . 'wp-admin/admin-footer.php';
 
 } else {
 	/**
diff --git a/wp-admin/upgrade.php b/wp-admin/upgrade.php
index 330ef0fd9d..54661ddb1e 100644
--- a/wp-admin/upgrade.php
+++ b/wp-admin/upgrade.php
@@ -15,12 +15,12 @@
 define( 'WP_INSTALLING', true );
 
 /** Load WordPress Bootstrap */
-require( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require dirname( dirname( __FILE__ ) ) . '/wp-load.php';
 
 nocache_headers();
 
 timer_start();
-require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+require_once ABSPATH . 'wp-admin/includes/upgrade.php';
 
 delete_site_transient( 'update_core' );
 
@@ -54,6 +54,15 @@ if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) ) {
 	$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
 }
 
+/* translators: %s: Update PHP page URL */
+$php_update_message = '<br>' . sprintf( __( '<a href="%s">Learn more about updating PHP</a>.' ), esc_url( wp_get_update_php_url() ) );
+
+$annotation = wp_get_update_php_annotation();
+
+if ( $annotation ) {
+	$php_update_message .= '<br><em>' . $annotation . '</em>';
+}
+
 @header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
 ?>
 <!DOCTYPE html>
@@ -87,10 +96,10 @@ elseif ( ! $php_compat || ! $mysql_compat ) :
 
 	if ( ! $mysql_compat && ! $php_compat ) {
 		/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Minimum required MySQL version number, 5: Current PHP version number, 6: Current MySQL version number */
-		$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version );
+		$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher and MySQL version %4$s or higher. You are running PHP version %5$s and MySQL version %6$s.' ), $version_url, $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) . $php_update_message;
 	} elseif ( ! $php_compat ) {
 		/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required PHP version number, 4: Current PHP version number */
-		$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_php_version, $php_version );
+		$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires PHP version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_php_version, $php_version ) . $php_update_message;
 	} elseif ( ! $mysql_compat ) {
 		/* translators: 1: URL to WordPress release notes, 2: WordPress version number, 3: Minimum required MySQL version number, 4: Current MySQL version number */
 		$message = sprintf( __( 'You cannot update because <a href="%1$s">WordPress %2$s</a> requires MySQL version %3$s or higher. You are running version %4$s.' ), $version_url, $wp_version, $required_mysql_version, $mysql_version );