php-pcntlHow to use pcntl_wait in PHP?

PCNTL_WAIT is a PHP function used to wait for a child process to finish executing. It is part of the Process Control (PCNTL) extension.

Example

<?php
$pid = pcntl_fork();
if ($pid == -1) {
    die('could not fork');
} else if ($pid) {
    // parent process
    pcntl_wait($status); //Protect against Zombie children
} else {
    // child process
    // do some work
    exit();
}
?>

The code above will create a child process and wait for it to finish executing before continuing.

Code explanation

• pcntl_fork(): Creates a child process
• pcntl_wait($status): Waits for the child process to finish executing
• exit(): Exits the child process

Helpful links

• PHP PCNTL_WAIT Manual
• PHP PCNTL Manual

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