* @param string $log 'production' will always trigger a php error, 'auto'
* will trigger an error if $wgDevelopmentWarnings is true, and 'debug'
* will only write to the debug log(s).
- *
- * @return mixed
*/
public static function warning( $msg, $callerOffset = 1, $level = E_USER_NOTICE, $log = 'auto' ) {
global $wgDevelopmentWarnings;