(PHP 5 >= 5.3.4, PHP 7) Alias of

(PECL libevent >= 0.0.2) Set the number of event priority levels

(PECL pthreads >= 2.0.0) Synchronization public

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Retrieve the error number set by the last posix function that failed

(PECL eio >= 0.0.1dev) Createsa request group.

(PHP 5 >= 5.3.4, PHP 7) Retrieve the error number set by the last pcntl function which failed

(PHP 4, PHP 5, PHP 7) Inserts or updates a variable in shared memory

(PECL pthreads >= 2.0.0) Synchronization public

(PECL eio >= 0.0.1dev) Does nothing, except go through the whole request cycle.

(PECL ev >= 0.2.0) Must be called after a fork