David Thomas Baker » PHP » PHP fork - how to use pcntl_fork();

Here's a bit of PHP showing how to use pcntl_fork();

useful if you need your script to do more than one thing at the same time.

<?

declare(ticks = 1);


$max=10;
$child=0;
function sig_handler($signo) {
  global $child;
  switch ($signo) {
   case SIGCHLD:
     //echo "SIGCHLD receivedn";
	 // clean up zombies
	 $pid = pcntl_waitpid(-1, $status, WNOHANG);
     $child -= 1;
	//exit;
  }
}
pcntl_signal(SIGCHLD, "sig_handler");

$website_scraper = new scraper();

foreach($res as  $r){
	while ($child >= $max) {
		sleep(5); //echo " - sleep $child n";
	  // pcntl_waitpid(0,$status);
   }
   $child++;
	$pid=pcntl_fork();
	
	
	if ($pid==-1) {
		die("Could not fork:n");
	}
	elseif ($pid) {
		// we're in the parent fork, dont do anything
	} 
	else {
		//example of what a child process could do:
                $website_scraper -> scraper("http://foo.com");
		exit;
	}

}


?>