How does session_start() function work in PHP and what are common pitfalls associated with it?

The session_start() function in PHP is used to start a new session or resume an existing session. It initializes session data and allows you to store and retrieve session variables. One common pitfall associated with session_start() is that it must be called before any output is sent to the browser. If you try to call session_start() after output has already been sent, you will encounter an error. To avoid this issue, make sure to call session_start() at the beginning of your PHP script, before any HTML or whitespace. 

<?php
// Start the session
session_start();

// Rest of your PHP code goes here
?>

Keywords

session_start PHP cookies session hijacking session_regenerate_id

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