How do I expire a PHP session after 30 minutes?

How do I expire a PHP session after 30 minutes?

php session cookies

php

Check if PHP session has already started

php session session-variables

php

"Keep Me Logged In" - the best approach

php security session remember-me

php

Cookies vs. sessions

php session cookies

php

PHP Pass variable to next page

php variables session

php

PHP: Storing 'objects' inside the $_SESSION

php session object

php

How to change the session timeout in PHP?

php session session-timeout

php

Do AJAX requests retain PHP Session info?

php ajax session

php

PHP Session Fixation / Hijacking

php security session session-cookies

php

"Cannot send session cache limiter - headers already sent" [duplicate]

php session

php

How to properly add cross-site request forgery (CSRF) token using PHP

php security session csrf

php

Why is the standard session lifetime 24 minutes (1440 seconds)?

php security session

php

When and why I should use session_regenerate_id()?

php session session-fixation

php

What are cookies and sessions, and how do they relate to each other?

javascript php session cookies

php

PHP Sessions across sub domains

php authentication session cross-domain

php