pcntl_fork
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
pcntl_fork — Forks the currently running process
Description
int pcntl_fork ( void )The pcntl_fork() function creates a child process that differs from the parent process only in its PID and PPID. Please see your system's fork(2) man page for specific details as to how fork works on your system.
Return Values
On success, the PID of the child process is returned in the parent's thread of execution, and a 0 is returned in the child's thread of execution. On failure, a -1 will be returned in the parent's context, no child process will be created, and a PHP error is raised.
Examples
Example #1 pcntl_fork() example
<?php
$pid?=?pcntl_fork();
if?($pid?==?-1)?{
?????die('could?not?fork');
}?else?if?($pid)?{
?????//?we?are?the?parent
?????pcntl_wait($status);?//Protect?against?Zombie?children
}?else?{
?????//?we?are?the?child
}
?>See Also
- pcntl_waitpid() - Waits on or returns the status of a forked child
- pcntl_signal() - Installs a signal handler
- setproctitle() - Set the process title
← pcntl_exec
pcntl_get_last_error →
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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