Pass false as the 2nd argument to class_exists() to disable autoloading and to not cause problems for those who define __autoload().
Fixes #20523. Built from https://develop.svn.wordpress.org/trunk@34348 git-svn-id: http://core.svn.wordpress.org/trunk@34312 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@@ -875,7 +875,7 @@ function wp_get_nav_menu_to_edit( $menu_id = 0 ) {
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*/
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$walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id );
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if ( class_exists( $walker_class_name ) )
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if ( class_exists( $walker_class_name, false ) )
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$walker = new $walker_class_name;
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else
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return new WP_Error( 'menu_walker_not_exist', sprintf( __('The Walker class named <strong>%s</strong> does not exist.'), $walker_class_name ) );
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