Ticket #18465: 18465.3.patch

wp-includes/functions.php

@@ -1844 +1844 @@
 
         do_action( 'do_robotstxt' );
 
-        $output = '';
+        $output = "User-agent: *\n";
         $public = get_option( 'blog_public' );
         if ( '0' ==  $public ) {
-                $output .= "User-agent: *\n";
                 $output .= "Disallow: /\n";
         } else {
-                $output .= "User-agent: *\n";
-                $output .= "Disallow:\n";
+                $site_url = parse_url( site_url() );
+                $path = ( empty( $site_url['path'] ) ) ? '' : $site_url['path'];
+                $output .= "Disallow: $path/wp-admin\n";
+                $output .= "Disallow: $path/wp-includes\n";
         }
 
         echo apply_filters('robots_txt', $output, $public);