Description:
------------
http://www.php.net/manual/en/function.flock.php

"On versions of PHP before 5.3.2, the lock is released also by fclose() (which 
is also called automatically when script finished)."

This is huge regression. I've used with success file locking to check if another 
instance of file is already running putting code like this in front of the 
script or append_script

$h55 = fopen($_SERVER['argv'][0],"r");
while(!flock($h55, LOCK_EX + LOCK_NB )) {
echo "cant get lock, die\n";
die();
}

or

$h55 = fopen($_SERVER['argv'][0],"r");
while(!flock($h55, LOCK_EX + LOCK_NB )) {
echo "cant get lock, waiting 10s\n";
sleep(10);
}

I've used it for scripts that had variable running time with a crontab. Now it 
is all impossible thanks to that change :(