You want to delete a file.
Use unlink( ), as shown in Example 24-16.
Deleting a file
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.
24.5.4. See Also
Documentation on unlink( ) at http://www.php.net/unlink.