diff --git a/wp-admin/custom-background.php b/wp-admin/custom-background.php
index ac2941f28a..c9ba796463 100644
--- a/wp-admin/custom-background.php
+++ b/wp-admin/custom-background.php
@@ -67,11 +67,11 @@ class Custom_Background {
 		if ( ! current_user_can('edit_theme_options') )
 			return;
 
-		$this->page = $page = add_theme_page(__('Background'), __('Background'), 'edit_theme_options', 'custom-background', array(&$this, 'admin_page'));
+		$this->page = $page = add_theme_page(__('Background'), __('Background'), 'edit_theme_options', 'custom-background', array($this, 'admin_page'));
 
-		add_action("load-$page", array(&$this, 'admin_load'));
-		add_action("load-$page", array(&$this, 'take_action'), 49);
-		add_action("load-$page", array(&$this, 'handle_upload'), 49);
+		add_action("load-$page", array($this, 'admin_load'));
+		add_action("load-$page", array($this, 'take_action'), 49);
+		add_action("load-$page", array($this, 'handle_upload'), 49);
 
 		if ( $this->admin_header_callback )
 			add_action("admin_head-$page", $this->admin_header_callback, 51);
diff --git a/wp-admin/custom-header.php b/wp-admin/custom-header.php
index d572594fe4..9b02a3f033 100644
--- a/wp-admin/custom-header.php
+++ b/wp-admin/custom-header.php
@@ -84,13 +84,13 @@ class Custom_Image_Header {
 		if ( ! current_user_can('edit_theme_options') )
 			return;
 
-		$this->page = $page = add_theme_page(__('Header'), __('Header'), 'edit_theme_options', 'custom-header', array(&$this, 'admin_page'));
+		$this->page = $page = add_theme_page(__('Header'), __('Header'), 'edit_theme_options', 'custom-header', array($this, 'admin_page'));
 
-		add_action("admin_print_scripts-$page", array(&$this, 'js_includes'));
-		add_action("admin_print_styles-$page", array(&$this, 'css_includes'));
-		add_action("admin_head-$page", array(&$this, 'help') );
-		add_action("admin_head-$page", array(&$this, 'take_action'), 50);
-		add_action("admin_head-$page", array(&$this, 'js'), 50);
+		add_action("admin_print_scripts-$page", array($this, 'js_includes'));
+		add_action("admin_print_styles-$page", array($this, 'css_includes'));
+		add_action("admin_head-$page", array($this, 'help') );
+		add_action("admin_head-$page", array($this, 'take_action'), 50);
+		add_action("admin_head-$page", array($this, 'js'), 50);
 		if ( $this->admin_header_callback )
 			add_action("admin_head-$page", $this->admin_header_callback, 51);
 	}
diff --git a/wp-admin/includes/class-wp-importer.php b/wp-admin/includes/class-wp-importer.php
index b017c84fcd..57ff7f4b93 100644
--- a/wp-admin/includes/class-wp-importer.php
+++ b/wp-admin/includes/class-wp-importer.php
@@ -179,7 +179,7 @@ class WP_Importer {
 	 */
 	function get_page( $url, $username = '', $password = '', $head = false ) {
 		// Increase the timeout
-		add_filter( 'http_request_timeout', array( &$this, 'bump_request_timeout' ) );
+		add_filter( 'http_request_timeout', array( $this, 'bump_request_timeout' ) );
 
 		$headers = array();
 		$args = array();
diff --git a/wp-admin/includes/class-wp-list-table.php b/wp-admin/includes/class-wp-list-table.php
index 22c35f5edc..4a0ad68c4c 100644
--- a/wp-admin/includes/class-wp-list-table.php
+++ b/wp-admin/includes/class-wp-list-table.php
@@ -87,7 +87,7 @@ class WP_List_Table {
 
 		$this->screen = convert_to_screen( $args['screen'] );
 
-		add_filter( "manage_{$this->screen->id}_columns", array( &$this, 'get_columns' ), 0 );
+		add_filter( "manage_{$this->screen->id}_columns", array( $this, 'get_columns' ), 0 );
 
 		if ( !$args['plural'] )
 			$args['plural'] = $this->screen->base;
@@ -99,7 +99,7 @@ class WP_List_Table {
 
 		if ( $args['ajax'] ) {
 			// wp_enqueue_script( 'list-table' );
-			add_action( 'admin_footer', array( &$this, '_js_vars' ) );
+			add_action( 'admin_footer', array( $this, '_js_vars' ) );
 		}
 	}
 
@@ -857,7 +857,7 @@ class WP_List_Table {
 			}
 			elseif ( method_exists( $this, 'column_' . $column_name ) ) {
 				echo "<td $attributes>";
-				echo call_user_func( array( &$this, 'column_' . $column_name ), $item );
+				echo call_user_func( array( $this, 'column_' . $column_name ), $item );
 				echo "</td>";
 			}
 			else {
diff --git a/wp-admin/includes/class-wp-ms-themes-list-table.php b/wp-admin/includes/class-wp-ms-themes-list-table.php
index 311593d896..73045dbfc5 100644
--- a/wp-admin/includes/class-wp-ms-themes-list-table.php
+++ b/wp-admin/includes/class-wp-ms-themes-list-table.php
@@ -84,7 +84,7 @@ class WP_MS_Themes_List_Table extends WP_List_Table {
 
 		if ( $s ) {
 			$status = 'search';
-			$themes['search'] = array_filter( array_merge( $themes['all'], $themes['broken'] ), array( &$this, '_search_callback' ) );
+			$themes['search'] = array_filter( array_merge( $themes['all'], $themes['broken'] ), array( $this, '_search_callback' ) );
 		}
 
 		$totals = array();
@@ -108,7 +108,7 @@ class WP_MS_Themes_List_Table extends WP_List_Table {
 				if ( 'ASC' == $order )
 					$this->items = array_reverse( $this->items );
 			} else {
-				uasort( $this->items, array( &$this, '_order_callback' ) );
+				uasort( $this->items, array( $this, '_order_callback' ) );
 			}
 		}
 
diff --git a/wp-admin/includes/class-wp-plugins-list-table.php b/wp-admin/includes/class-wp-plugins-list-table.php
index ae1d1b8d8d..956840e5a1 100644
--- a/wp-admin/includes/class-wp-plugins-list-table.php
+++ b/wp-admin/includes/class-wp-plugins-list-table.php
@@ -99,7 +99,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 
 		if ( $s ) {
 			$status = 'search';
-			$plugins['search'] = array_filter( $plugins['all'], array( &$this, '_search_callback' ) );
+			$plugins['search'] = array_filter( $plugins['all'], array( $this, '_search_callback' ) );
 		}
 
 		$totals = array();
@@ -121,7 +121,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 			$orderby = ucfirst( $orderby );
 			$order = strtoupper( $order );
 
-			uasort( $this->items, array( &$this, '_order_callback' ) );
+			uasort( $this->items, array( $this, '_order_callback' ) );
 		}
 
 		$plugins_per_page = $this->get_items_per_page( str_replace( '-', '_', $screen->id . '_per_page' ), 999 );
diff --git a/wp-admin/includes/class-wp-upgrader.php b/wp-admin/includes/class-wp-upgrader.php
index 3ab054ae74..0c9e0cc5d7 100644
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -403,7 +403,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 		$this->init();
 		$this->install_strings();
 
-		add_filter('upgrader_source_selection', array(&$this, 'check_package') );
+		add_filter('upgrader_source_selection', array($this, 'check_package') );
 
 		$this->run(array(
 					'package' => $package,
@@ -413,7 +413,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 					'hook_extra' => array()
 					));
 
-		remove_filter('upgrader_source_selection', array(&$this, 'check_package') );
+		remove_filter('upgrader_source_selection', array($this, 'check_package') );
 
 		if ( ! $this->result || is_wp_error($this->result) )
 			return $this->result;
@@ -443,9 +443,9 @@ class Plugin_Upgrader extends WP_Upgrader {
 		// Get the URL to the zip file
 		$r = $current->response[ $plugin ];
 
-		add_filter('upgrader_pre_install', array(&$this, 'deactivate_plugin_before_upgrade'), 10, 2);
-		add_filter('upgrader_clear_destination', array(&$this, 'delete_old_plugin'), 10, 4);
-		//'source_selection' => array(&$this, 'source_selection'), //there's a trac ticket to move up the directory for zip's which are made a bit differently, useful for non-.org plugins.
+		add_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'), 10, 2);
+		add_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'), 10, 4);
+		//'source_selection' => array($this, 'source_selection'), //there's a trac ticket to move up the directory for zip's which are made a bit differently, useful for non-.org plugins.
 
 		$this->run(array(
 					'package' => $r->package,
@@ -458,8 +458,8 @@ class Plugin_Upgrader extends WP_Upgrader {
 				));
 
 		// Cleanup our hooks, in case something else does a upgrade on this connection.
-		remove_filter('upgrader_pre_install', array(&$this, 'deactivate_plugin_before_upgrade'));
-		remove_filter('upgrader_clear_destination', array(&$this, 'delete_old_plugin'));
+		remove_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'));
+		remove_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'));
 
 		if ( ! $this->result || is_wp_error($this->result) )
 			return $this->result;
@@ -480,7 +480,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 
 		$current = get_site_transient( 'update_plugins' );
 
-		add_filter('upgrader_clear_destination', array(&$this, 'delete_old_plugin'), 10, 4);
+		add_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'), 10, 4);
 
 		$this->skin->header();
 
@@ -550,7 +550,7 @@ class Plugin_Upgrader extends WP_Upgrader {
 		$this->skin->footer();
 
 		// Cleanup our hooks, in case something else does a upgrade on this connection.
-		remove_filter('upgrader_clear_destination', array(&$this, 'delete_old_plugin'));
+		remove_filter('upgrader_clear_destination', array($this, 'delete_old_plugin'));
 
 		// Force refresh of plugin update information
 		delete_site_transient('update_plugins');
@@ -712,7 +712,7 @@ class Theme_Upgrader extends WP_Upgrader {
 		if ( ! $api || is_wp_error($api) ) {
 			$this->skin->feedback( 'parent_theme_not_found', $theme_info->get('Template') );
 			// Don't show activate or preview actions after install
-			add_filter('install_theme_complete_actions', array(&$this, 'hide_activate_preview_actions') );
+			add_filter('install_theme_complete_actions', array($this, 'hide_activate_preview_actions') );
 			return $install_result;
 		}
 
@@ -737,7 +737,7 @@ class Theme_Upgrader extends WP_Upgrader {
 		) );
 
 		if ( is_wp_error($parent_result) )
-			add_filter('install_theme_complete_actions', array(&$this, 'hide_activate_preview_actions') );
+			add_filter('install_theme_complete_actions', array($this, 'hide_activate_preview_actions') );
 
 		// Start cleaning up after the parents installation
 		remove_filter('install_theme_complete_actions', '__return_false', 999);
@@ -760,8 +760,8 @@ class Theme_Upgrader extends WP_Upgrader {
 		$this->init();
 		$this->install_strings();
 
-		add_filter('upgrader_source_selection', array(&$this, 'check_package') );
-		add_filter('upgrader_post_install', array(&$this, 'check_parent_theme_filter'), 10, 3);
+		add_filter('upgrader_source_selection', array($this, 'check_package') );
+		add_filter('upgrader_post_install', array($this, 'check_parent_theme_filter'), 10, 3);
 
 		$options = array(
 			'package' => $package,
@@ -772,8 +772,8 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		$this->run($options);
 
-		remove_filter('upgrader_source_selection', array(&$this, 'check_package') );
-		remove_filter('upgrader_post_install', array(&$this, 'check_parent_theme_filter'));
+		remove_filter('upgrader_source_selection', array($this, 'check_package') );
+		remove_filter('upgrader_post_install', array($this, 'check_parent_theme_filter'));
 
 		if ( ! $this->result || is_wp_error($this->result) )
 			return $this->result;
@@ -802,9 +802,9 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		$r = $current->response[ $theme ];
 
-		add_filter('upgrader_pre_install', array(&$this, 'current_before'), 10, 2);
-		add_filter('upgrader_post_install', array(&$this, 'current_after'), 10, 2);
-		add_filter('upgrader_clear_destination', array(&$this, 'delete_old_theme'), 10, 4);
+		add_filter('upgrader_pre_install', array($this, 'current_before'), 10, 2);
+		add_filter('upgrader_post_install', array($this, 'current_after'), 10, 2);
+		add_filter('upgrader_clear_destination', array($this, 'delete_old_theme'), 10, 4);
 
 		$options = array(
 			'package' => $r['package'],
@@ -818,9 +818,9 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		$this->run($options);
 
-		remove_filter('upgrader_pre_install', array(&$this, 'current_before'));
-		remove_filter('upgrader_post_install', array(&$this, 'current_after'));
-		remove_filter('upgrader_clear_destination', array(&$this, 'delete_old_theme'));
+		remove_filter('upgrader_pre_install', array($this, 'current_before'));
+		remove_filter('upgrader_post_install', array($this, 'current_after'));
+		remove_filter('upgrader_clear_destination', array($this, 'delete_old_theme'));
 
 		if ( ! $this->result || is_wp_error($this->result) )
 			return $this->result;
@@ -840,9 +840,9 @@ class Theme_Upgrader extends WP_Upgrader {
 
 		$current = get_site_transient( 'update_themes' );
 
-		add_filter('upgrader_pre_install', array(&$this, 'current_before'), 10, 2);
-		add_filter('upgrader_post_install', array(&$this, 'current_after'), 10, 2);
-		add_filter('upgrader_clear_destination', array(&$this, 'delete_old_theme'), 10, 4);
+		add_filter('upgrader_pre_install', array($this, 'current_before'), 10, 2);
+		add_filter('upgrader_post_install', array($this, 'current_after'), 10, 2);
+		add_filter('upgrader_clear_destination', array($this, 'delete_old_theme'), 10, 4);
 
 		$this->skin->header();
 
@@ -912,9 +912,9 @@ class Theme_Upgrader extends WP_Upgrader {
 		$this->skin->footer();
 
 		// Cleanup our hooks, in case something else does a upgrade on this connection.
-		remove_filter('upgrader_pre_install', array(&$this, 'current_before'));
-		remove_filter('upgrader_post_install', array(&$this, 'current_after'));
-		remove_filter('upgrader_clear_destination', array(&$this, 'delete_old_theme'));
+		remove_filter('upgrader_pre_install', array($this, 'current_before'));
+		remove_filter('upgrader_post_install', array($this, 'current_after'));
+		remove_filter('upgrader_clear_destination', array($this, 'delete_old_theme'));
 
 		// Force refresh of theme update information
 		wp_clean_themes_cache();
diff --git a/wp-admin/includes/list-table.php b/wp-admin/includes/list-table.php
index 071df0dcc5..2403ec859a 100644
--- a/wp-admin/includes/list-table.php
+++ b/wp-admin/includes/list-table.php
@@ -95,7 +95,7 @@ class _WP_List_Table_Compat extends WP_List_Table {
 
 		if ( !empty( $columns ) ) {
 			$this->_columns = $columns;
-			add_filter( 'manage_' . $screen->id . '_columns', array( &$this, 'get_columns' ), 0 );
+			add_filter( 'manage_' . $screen->id . '_columns', array( $this, 'get_columns' ), 0 );
 		}
 	}