enable chmod permission

[Anon]

I have a PHP program that requires the use of the chmod function. But when trying to use it I get the following error:

Warning: chmod failed: Operation not permitted in /home/ruter/ruter-www/fbc2/import/subs.php on line 268

I know it is not in safe mode (and I know that does not cause the problem). I've heard it is because the user "nobody" that PHP uses does not have any authority to chmod. I use a ISP which runs on Linux, how do I configure PHP on runtime or at another time, to give me the power to chmod?

Thanks

[Anon]

Please show your code ..

[Anon]

Well, all that I am doing is:

chmod($file, 0666);

and I get the error message.