Index: wp-admin/admin-footer.php
===================================================================
--- wp-admin/admin-footer.php	(revision 38288)
+++ wp-admin/admin-footer.php	(working copy)
@@ -83,7 +83,7 @@
  *
  * @param string $hook_suffix The current admin page.
  */
-do_action( "admin_print_footer_scripts-$hook_suffix" );
+do_action( "admin_print_footer_scripts-{$hook_suffix}" );
 
 /**
  * Prints any scripts and data queued for the footer.
@@ -103,7 +103,7 @@
  * @global string $hook_suffix
  * @param string $hook_suffix The current admin page.
  */
-do_action( "admin_footer-$hook_suffix" );
+do_action( "admin_footer-{$hook_suffix}" );
 
 // get_site_option() won't exist when auto upgrading from <= 2.7
 if ( function_exists('get_site_option') ) {
Index: wp-admin/admin-header.php
===================================================================
--- wp-admin/admin-header.php	(revision 38288)
+++ wp-admin/admin-header.php	(working copy)
@@ -96,7 +96,7 @@
  *
  * @since 2.6.0
  */
-do_action( "admin_print_styles-$hook_suffix" );
+do_action( "admin_print_styles-{$hook_suffix}" );
 
 /**
  * Fires when styles are printed for all admin pages.
@@ -110,7 +110,7 @@
  *
  * @since 2.1.0
  */
-do_action( "admin_print_scripts-$hook_suffix" );
+do_action( "admin_print_scripts-{$hook_suffix}" );
 
 /**
  * Fires when scripts are printed for all admin pages.
@@ -127,7 +127,7 @@
  *
  * @since 2.1.0
  */
-do_action( "admin_head-$hook_suffix" );
+do_action( "admin_head-{$hook_suffix}" );
 
 /**
  * Fires in head section for all admin pages.
Index: wp-admin/admin.php
===================================================================
--- wp-admin/admin.php	(revision 38288)
+++ wp-admin/admin.php	(working copy)
@@ -209,7 +209,7 @@
 		 *
 		 * @since 2.1.0
 		 */
-		do_action( 'load-' . $page_hook );
+		do_action( "load-{$page_hook}" );
 		if (! isset($_GET['noheader']))
 			require_once(ABSPATH . 'wp-admin/admin-header.php');
 
@@ -239,7 +239,7 @@
 		 *
 		 * @since 1.5.0
 		 */
-		do_action( 'load-' . $plugin_page );
+		do_action( "load-{$plugin_page}" );
 
 		if ( !isset($_GET['noheader']))
 			require_once(ABSPATH . 'wp-admin/admin-header.php');
@@ -278,7 +278,7 @@
 	 *
 	 * @since 3.5.0
 	 */
-	do_action( 'load-importer-' . $importer );
+	do_action( "load-importer-{$importer}" );
 
 	$parent_file = 'tools.php';
 	$submenu_file = 'import.php';
@@ -326,7 +326,7 @@
 	 *
 	 * @since 2.1.0
 	 */
-	do_action( 'load-' . $pagenow );
+	do_action( "load-{$pagenow}" );
 
 	/*
 	 * The following hooks are fired to ensure backward compatibility.
Index: wp-admin/edit-form-advanced.php
===================================================================
--- wp-admin/edit-form-advanced.php	(revision 38288)
+++ wp-admin/edit-form-advanced.php	(working copy)
@@ -331,7 +331,7 @@
  *
  * @param WP_Post $post Post object.
  */
-do_action( 'add_meta_boxes_' . $post_type, $post );
+do_action( "add_meta_boxes_{$post_type}", $post );
 
 /**
  * Fires after meta boxes have been added.
Index: wp-includes/option.php
===================================================================
--- wp-includes/option.php	(revision 38288)
+++ wp-includes/option.php	(working copy)
@@ -534,7 +534,7 @@
 		 *
 		 * @param string $option Name of the deleted option.
 		 */
-		do_action( "delete_option_$option", $option );
+		do_action( "delete_option_{$option}", $option );
 
 		/**
 		 * Fires after an option has been deleted.
@@ -568,7 +568,7 @@
 	 *
 	 * @param string $transient Transient name.
 	 */
-	do_action( 'delete_transient_' . $transient, $transient );
+	do_action( "delete_transient_{$transient}", $transient );
 
 	if ( wp_using_ext_object_cache() ) {
 		$result = wp_cache_delete( $transient, 'transient' );
@@ -758,7 +758,7 @@
 		 * @param int    $expiration Time until expiration in seconds.
 		 * @param string $transient  The name of the transient.
 		 */
-		do_action( 'set_transient_' . $transient, $value, $expiration, $transient );
+		do_action( "set_transient_{$transient}", $value, $expiration, $transient );
 
 		/**
 		 * Fires after the value for a transient has been set.
@@ -1271,7 +1271,7 @@
 		 * @param string $option Name of the network option.
 		 * @param mixed  $value  Value of the network option.
 		 */
-		do_action( 'add_site_option_' . $option, $option, $value );
+		do_action( "add_site_option_{$option}", $option, $value );
 
 		/**
 		 * Fires after a network option has been successfully added.
@@ -1327,7 +1327,7 @@
 	 *
 	 * @param string $option Option name.
 	 */
-	do_action( 'pre_delete_site_option_' . $option, $option );
+	do_action( "pre_delete_site_option_{$option}", $option );
 
 	if ( ! is_multisite() ) {
 		$result = delete_option( $option );
@@ -1354,7 +1354,7 @@
 		 *
 		 * @param string $option Name of the network option.
 		 */
-		do_action( 'delete_site_option_' . $option, $option );
+		do_action( "delete_site_option_{$option}", $option );
 
 		/**
 		 * Fires after a network option has been deleted.
@@ -1462,7 +1462,7 @@
 		 * @param mixed  $value     Current value of the network option.
 		 * @param mixed  $old_value Old value of the network option.
 		 */
-		do_action( 'update_site_option_' . $option, $option, $value, $old_value );
+		do_action( "update_site_option_{$option}", $option, $value, $old_value );
 
 		/**
 		 * Fires after the value of a network option has been successfully updated.
@@ -1500,7 +1500,7 @@
 	 *
 	 * @param string $transient Transient name.
 	 */
-	do_action( 'delete_site_transient_' . $transient, $transient );
+	do_action( "delete_site_transient_{$transient}", $transient );
 
 	if ( wp_using_ext_object_cache() ) {
 		$result = wp_cache_delete( $transient, 'site-transient' );
@@ -1671,7 +1671,7 @@
 		 * @param int    $expiration Time until expiration in seconds.
 		 * @param string $transient  Transient name.
 		 */
-		do_action( 'set_site_transient_' . $transient, $value, $expiration, $transient );
+		do_action( "set_site_transient_{$transient}", $value, $expiration, $transient );
 
 		/**
 		 * Fires after the value for a site transient has been set.