PHP Unconference Europe 2015

Basic usage

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

Example #1 Process Control Example

<?php
declare(ticks=1);

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

// detatch 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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