(PECL eio >= 0.0.1dev) Returns number of finished, but unhandled requests

(PECL ev >= 0.2.0) Begin checking for events and calling callbacks for the loop

(PHP 5 >= 5.3.0, PHP 7) Check whether a message queue exists

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Returns information from the message queue data structure

(PECL eio >= 0.0.1dev) Change file last access and modification times.

(PECL ev >= 0.2.0) Returns recursion depth

(PECL ev >= 0.2.0) Creates EvSignal watcher object associated with the current event loop instance

(PECL libevent >= 0.0.1) Destroy event base

(PECL expect >= 0.1.0) Execute command via Bourne shell, and open the PTY stream to the process

(PHP 4, PHP 5, PHP 7) Return info about a user by username