(PHP 7) Set system resource limits bool posix_setrlimit

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

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Receive a message from a message queue

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

(PECL ev >= 0.2.0) Creates instance of a stopped EvIdle watcher object

(PECL eio >= 0.0.1dev) Create a symbolic link

(PHP 4, PHP 5, PHP 7) Determine if a file descriptor is an interactive terminal

(PECL ev >= 0.2.0) Stops the default event loop

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Create or open shared memory block

(PECL eio >= 0.0.1dev) Read from a file descriptor at given offset.