Definition: Session_start() is used in PHP to initiate a session on each PHP page. It must be the first thing sent to the browser, or it won't work properly, so it's usually best to place it right after the <?php tags. This must be on every page you intend to use sessions on. For more information read our sessions tutorial.
Also Known As: Start Session PHP
<?php // this starts the session session_start(); // this sets variables in the session $_SESSION['test']='testing'; print "Done"; ?>