What are the potential pitfalls of not using session_start() at the beginning of every PHP script, and how can this lead to session data loss?

Not using session_start() at the beginning of every PHP script can lead to session data loss because it initializes a session or resumes the current one based on a session identifier passed via a GET or POST request, or a cookie. Without session_start(), session data will not be stored or retrieved properly, resulting in potential loss of user-specific information. 

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

// Rest of the PHP script
?>

Keywords

session_start PHP script session data loss session variables session management

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