--- a/wp/wp-admin/load-styles.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-admin/load-styles.php	Mon Oct 14 17:39:30 2019 +0200
@@ -8,94 +8,21 @@
 error_reporting(0);
 
 /** Set ABSPATH for execution */
-define( 'ABSPATH', dirname(dirname(__FILE__)) . '/' );
+if ( ! defined( 'ABSPATH' ) ) {
+	define( 'ABSPATH', dirname( dirname( __FILE__ ) ) . '/' );
+}
+
 define( 'WPINC', 'wp-includes' );
 
-/**
- * @ignore
- */
-function __() {}
-
-/**
- * @ignore
- */
-function _x() {}
-
-/**
- * @ignore
- */
-function add_filter() {}
-
-/**
- * @ignore
- */
-function esc_attr() {}
-
-/**
- * @ignore
- */
-function apply_filters() {}
-
-/**
- * @ignore
- */
-function get_option() {}
-
-/**
- * @ignore
- */
-function is_lighttpd_before_150() {}
-
-/**
- * @ignore
- */
-function add_action() {}
-
-/**
- * @ignore
- */
-function do_action_ref_array() {}
-
-/**
- * @ignore
- */
-function get_bloginfo() {}
-
-/**
- * @ignore
- */
-function is_admin() {return true;}
-
-/**
- * @ignore
- */
-function site_url() {}
-
-/**
- * @ignore
- */
-function admin_url() {}
-
-/**
- * @ignore
- */
-function wp_guess_url() {}
-
-function get_file($path) {
-
-	if ( function_exists('realpath') )
-		$path = realpath($path);
-
-	if ( ! $path || ! @is_file($path) )
-		return '';
-
-	return @file_get_contents($path);
-}
-
+require( ABSPATH . 'wp-admin/includes/noop.php' );
 require( ABSPATH . WPINC . '/script-loader.php' );
 require( ABSPATH . WPINC . '/version.php' );
 
-$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $_GET['load'] );
+$load = $_GET['load'];
+if ( is_array( $load ) ) {
+	$load = implode( '', $load );
+}
+$load = preg_replace( '/[^a-z0-9,_-]+/i', '', $load );
 $load = array_unique( explode( ',', $load ) );
 
 if ( empty($load) )
@@ -110,11 +37,25 @@
 $wp_styles = new WP_Styles();
 wp_default_styles($wp_styles);
 
-foreach( $load as $handle ) {
+if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $wp_version ) {
+	$protocol = $_SERVER['SERVER_PROTOCOL'];
+	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
+		$protocol = 'HTTP/1.0';
+	}
+	header( "$protocol 304 Not Modified" );
+	exit();
+}
+
+foreach ( $load as $handle ) {
 	if ( !array_key_exists($handle, $wp_styles->registered) )
 		continue;
 
 	$style = $wp_styles->registered[$handle];
+
+	if ( empty( $style->src ) ) {
+		continue;
+	}
+
 	$path = ABSPATH . $style->src;
 
 	if ( $rtl && ! empty( $style->extra['rtl'] ) ) {
@@ -134,6 +75,7 @@
 	}
 }
 
+header("Etag: $wp_version");
 header('Content-Type: text/css; charset=UTF-8');
 header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
 header("Cache-Control: public, max-age=$expires_offset");