What is the best way to store and pass a randomized string generated by a PHP function as a POST variable in a form?

When storing and passing a randomized string generated by a PHP function as a POST variable in a form, it is best to store the generated string in a session variable and then pass it as a hidden input field in the form. This ensures that the randomized string remains consistent throughout the form submission process. 

<?php
session_start();

// Generate a random string
$randomString = bin2hex(random_bytes(16));

// Store the random string in a session variable
$_SESSION['random_string'] = $randomString;
?>

<form method="post" action="process_form.php">
    <input type="hidden" name="random_string" value="<?php echo $_SESSION['random_string']; ?>">
    <!-- Other form fields here -->
    <button type="submit">Submit</button>
</form>

Keywords

PHP random string POST variable form data storage

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