Regarding the change in PHP 5.3.2 with locked files:
Without having studied the PHP source code in detail, the situation appears to be as follows when the PHP function fclose() is called:
Before 5.3.2 PHP would check if the file was locked, then release the lock, and then close the file.
From 5.3.2 PHP just closes the file.
But note, that the operating system releases the lock automatically when the file is closed. Therefore a call to fclose() STILL releases the lock (this is tested with PHP 5.3.2, Linux, x64).
