PHP Unlink Not working

Question

I am trying to delete photo in php using unlink. I have used it earlier on other server but this time it is not working. I have used absolute path for a test but still does

Answer 1

unlink($fileName); failed for me.
Then I tried using the realpath($fileName) function as unlink(realpath($fileName)); it worked.

Just posting it, in case if any one finds it useful.

php unlink