note 8411 added to flock

I had to play around a bit with flock() until I understood the explanations on this page. Here's what I figured out: You use flock($fp,2) to lock a file while writing to it. If it is already locked the server seems to wait until it's unlocked. If you want instant feedback use flock($fp,6) which will return immediately if the file is already locked. That's what LOCK_NB is all about. http://www.php.net/manual/function.flock.php