19.6.1 Problem
19.6.2 Solution
unlink($file) or die ("can't delete $file: $php_errormsg");
19.6.3 Discussion
The function unlink( ) is only able to delete files
that the user of the PHP process is able to delete. If you're having trouble
getting unlink( ) to work, check the permissions on the file and how
you're running PHP.