When to use session_start()?

php, session

Solution

Use it once per page, at the very top, before you plan to use any $_SESSION variables

Problem

I've been going through some `$_SESSION` examples and I'm a little confused, should i use `session_start()` every time before I access or set `$_SESSION['variable']` or should I only use `session_start()` once per page or just once the user has successfully logged in?

Original source