What common mistake can lead to session ID issues in PHP code?

One common mistake that can lead to session ID issues in PHP code is not starting the session before accessing or setting session variables. This can result in the session ID not being properly initialized, leading to inconsistent session data or errors. To solve this issue, always make sure to start the session at the beginning of your PHP script using session_start() function. This ensures that the session ID is properly generated and maintained throughout the session. 

<?php
session_start();

// Access or set session variables here
$_SESSION['user_id'] = 123;
?>

Keywords

session ID PHP code security vulnerability session fixation session hijacking

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