How can you ensure that the session_id remains the same when submitting a form to itself in PHP?

When submitting a form to itself in PHP, you can ensure that the session_id remains the same by starting the session at the beginning of the script and using session_regenerate_id(false) to prevent the session id from changing on each request. 

<?php
session_start();
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Process form data
}

session_regenerate_id(false);
?>

Keywords

session_id form submission PHP session_regenerate_id session fixation

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