What could cause session_start() to delete all $_SESSION data in PHP?

Session data in PHP can be deleted if the session is not properly started or if there is an issue with the session storage. To solve this issue, make sure to call session_start() at the beginning of every page that needs to access session data. Additionally, check the session.save_path configuration in php.ini to ensure that sessions are being stored correctly. 

<?php
session_start();

// Your PHP code here

Keywords

session_start $_SESSION data deletion PHP error

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