/**标签:www,Threaded,0.0,pthreads,Stackable,php,class From: https://blog.51cto.com/u_6778639/6096164
* Stackable is an alias of Threaded. This class name was used in pthreads until
* version 2.0.0
* @link http://www.php.net/manual/en/class.threaded.php
*/
class Stackable extends Threaded implements Traversable, Countable, ArrayAccess {}