+ /**
+ * Checks, if a url is pointing to the own server
+ *
+ * @param $internal String the server to check against
+ * @param $url String the url to check
+ * @return bool
+ */
+ static function isLinkInternal( $internal, $url ) {
+ return (bool)preg_match( '/^' .
+ # If server is proto relative, check also for http/https links
+ ( substr( $internal, 0, 2 ) === '//' ? '(?:https?:)?' : '' ) .
+ preg_quote( $internal, '/' ) .
+ # check for query/path/anchor or end of link in each case
+ '(?:[\?\/\#]|$)/i',
+ $url
+ );
+ }
+