Ticket #24068: link-template.php.diff

wp-includes/link-template.php

@@ -2036 +2036 @@
  * @package WordPress
  * @since 2.6.0
  *
- * @param string $path Optional. Path relative to the content url.
+ * @param string $path Optional. Path relative to the content url, or an absolute real path pointing inside WP_CONTENT_DIR
  * @return string Content url link with optional path appended.
 */
 function content_url($path = '') {
         $url = set_url_scheme( WP_CONTENT_URL );
+        $original_path = $path;
 
-        if ( $path && is_string( $path ) )
+        if ( $path && is_string( $path ) ) {
+                // Handle absolute path pointing inside WP_CONTENT_DIR
+                if ( strpos( $path, WP_CONTENT_DIR ) === 0 ) {
+                        $path = realpath($path);
+                        $content_dir_segment = DIRECTORY_SEPARATOR . basename( WP_CONTENT_DIR ) . DIRECTORY_SEPARATOR;
+                        $until_content_dir_pattern = sprintf( '#^.+%s#', preg_quote( $content_dir_segment, '#' ) );
+                        $path = preg_replace( $until_content_dir_pattern, '', $path );
+                        $path = str_replace('\\', '/', $path); // sanitize for Win32 installs
+                }
                 $url .= '/' . ltrim($path, '/');
+        }
 
-        return apply_filters('content_url', $url, $path);
+        return apply_filters('content_url', $url, $original_path);
 }
 
 /**