PHP: Basic usage

Basic usage

This example forks off a daemon process with a signal handler.

Example #1 Process Control Example

<?php
pcntl_async_signals(true);

$pid = pcntl_fork();
if ($pid == -1) {
     die("could not fork"); 
} else if ($pid) {
     exit(); / we are the parent 
} else {
     / we are the child
}

/ detach from the controlling terminal
if (posix_setsid() == -1) {
    die("could not detach from terminal");
}

/ setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");

/ loop forever performing tasks
while (1) {

    / do something interesting here

}

function sig_handler($signo) 
{

     switch ($signo) {
         case SIGTERM:
             / handle shutdown tasks
             exit;
             break;
         case SIGHUP:
             / handle restart tasks
             break;
         default:
             / handle all other signals
     }

}

?>

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