Are there any built-in PHP functions or classes that can simplify the process of implementing a "Back" button functionality for session variables in a form?

To implement a "Back" button functionality for session variables in a form, you can use the header() function to redirect back to the previous page where the form was submitted. You can store the form data in session variables before redirecting, so that the data is retained when the user navigates back to the form. 

<?php
session_start();

if($_SERVER['REQUEST_METHOD'] == 'POST'){
    $_SESSION['form_data'] = $_POST;
    header('Location: ' . $_SERVER['HTTP_REFERER']);
    exit;
}

if(isset($_SESSION['form_data'])){
    $form_data = $_SESSION['form_data'];
    unset($_SESSION['form_data']);
} else {
    $form_data = array();
}

// Display form with $form_data values pre-filled
?>

Keywords

PHP session variables form built-in functions classes

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