Description:
------------
The touch command dose not work, if the user (eg. www) is not owner of the file, and the file chmod is 0777, allowing a touch by the system.

Reproduce code:
---------------
<?php
/**
 * expects you created a file called touch_test not 
 * owned by the user running the script
 */
touch('touch_test', time());
?>

Expected result:
----------------
I expect the touch to work :)

Actual result:
--------------
Touch generates a error about permissions, eg:

Warning: touch(): Utime failed: Operation not permitted in /usr/local/lib/php/Cache/Container/file.php on line 159