how to logout from a php session - session_destroy doesn't seem to be enough

Question

I\'m trying to learn PHP and using sessions. I seen examples about using session_destroy on logout, but I see this in the php documentation:

In order

Answer 1

There's, like, an example answering your question just below the paragraph you just quoted: http://php.net/manual/en/function.session-destroy.php

Example #1 Destroying a session with $_SESSION