How does the browser handle POST requests in relation to transferring session IDs in PHP forms?

When handling POST requests in PHP forms, session IDs can be transferred by using a hidden input field within the form. This hidden input field should contain the session ID value retrieved from the $_COOKIE superglobal. By including this hidden input field in the form, the browser will automatically send the session ID along with the POST request data. 

<?php
session_start();
$session_id = session_id();
?>

<form method="post" action="process_form.php">
    <input type="hidden" name="session_id" value="<?php echo $session_id; ?>">
    <!-- other form fields here -->
    <button type="submit">Submit</button>
</form>

Keywords

POST requests session IDs PHP forms browser handling data transfer

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