........................................................... .......................................... ............................................... ................................ ??????????????????????????????? ??????????????????????????????? ??????????????????????????????? ................................ ................................. ............................... >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>. $capabilities Optional. Associative array of capabilities to test against, i.e. `['' => true]`. * @return bool Whether the transport can be used. */ public static function test($capabilities = []); }