Ticket #9246: file.diff

file.php

@@ -67 +67 @@
  */
 function get_home_path() {
         $home = get_option( 'home' );
-        if ( $home != '' && $home != get_option( 'siteurl' ) ) {
-                $home_path = parse_url( $home );
-                $home_path = $home_path['path'];
-                $root = str_replace( $_SERVER["PHP_SELF"], '', $_SERVER["SCRIPT_FILENAME"] );
-                $home_path = trailingslashit( $root.$home_path );
+        $siteurl = get_option( 'siteurl' );
+        if ( $home != '' && $home != $siteurl ) {
+                $wp_path_rel_to_home = str_replace($home, '', $siteurl); /* $siteurl - $home */
+                $pos = strpos($_SERVER["SCRIPT_FILENAME"], $wp_path_rel_to_home);
+                $home_path = substr($_SERVER["SCRIPT_FILENAME"], 0, $pos);        
+                $home_path = trailingslashit( $home_path );
         } else {
                 $home_path = ABSPATH;
         }