(PHP 4, PHP 5, PHP 7) Return the parent process identifier

(PECL eio >= 0.0.1dev) Change the name or location of a file.

(PECL eio >= 0.0.1dev) Get the canonicalized absolute pathname.

(PHP 4, PHP 5, PHP 7) Get a semaphore id resource

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Send a message to a message queue

(PECL pthreads >= 2.0.0) Manipulation public

(PECL ev >= 0.2.0) Restarts the timer watcher

(PHP 4, PHP 5, PHP 7) Disconnects from shared memory segment

(PECL pthreads >= 2.0.0) Execution public

(PHP 5 >= 5.3.0, PHP 7) Check whether a specific entry exists