* @param string $url Either fully-qualified or a local path + query
* @param string $defaultProto One of the PROTO_* constants. Determines the
* protocol to use if $url or $wgServer is protocol-relative
- * @return string Fully-qualified URL, current-path-relative URL or false if
+ * @return string|false Fully-qualified URL, current-path-relative URL or false if
* no valid URL can be constructed
*/
function wfExpandUrl( $url, $defaultProto = PROTO_CURRENT ) {