How to detect whether a PHP script is already running?

Question

I have a cron script that executes a PHP script every 10 minutes. The script checks a queue and processes the data in the queue. Sometimes the queue has enough data to last ov

Answer 1

If you are running Linux, this should work at the top of your script:

$running = exec("ps aux|grep ". basename(__FILE__) ."|grep -v grep|wc -l");
if($running > 1) {
   exit;
}