In what scenarios would using $_GET and $_POST variables not work effectively for retaining form data in PHP?

When dealing with sensitive information such as passwords or credit card details, using $_GET and $_POST variables may not be the most secure option as the data is visible in the URL or request body. In such scenarios, it is recommended to use sessions to store and retrieve form data securely. 

<?php
session_start();

// Store form data in session variables
$_SESSION['username'] = $_POST['username'];
$_SESSION['email'] = $_POST['email'];

// Retrieve form data from session variables
$username = $_SESSION['username'];
$email = $_SESSION['email'];
?>

Keywords

$_SESSION cookies AJAX form validation server-side validation

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