pcntl_fork
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
pcntl_fork — Forks the currently running process
Description
pcntl_fork(): int
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.
Parameters
This function has no parameters.
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_rfork() - Manipulates process resources
- pcntl_waitpid() - Waits on or returns the status of a forked child
- pcntl_signal() - Installs a signal handler
- cli_set_process_title() - Sets the process title
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