public static function getUrl($url = false)
    {
        $url = false !== $url ? $url : self::$_url;
        return $url;
    }
public static function getUrl($url = false)
    {
        $url = false !== $url ? $url : self::$_url;
        return $url;
    }
public static function getUrl ( $ url = false ) { $ url = false !== $ url ? $ url : self :: $ _url ; return $ url ; }
Ensure the URL is set, return default otherwise
@return string
Ensure the URL is set return default otherwise