What are common pitfalls when trying to connect forms with PHP sessions?

One common pitfall when connecting forms with PHP sessions is forgetting to start the session before trying to access or set session variables. To solve this, make sure to call session_start() at the beginning of your PHP script before using any session-related functions. 

<?php
session_start();

// Check if form data has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store form data in session variables
    $_SESSION["username"] = $_POST["username"];
    $_SESSION["email"] = $_POST["email"];
    
    // Redirect to another page
    header("Location: another_page.php");
    exit();
}
?>

Keywords

PHP sessions form submission session variables CSRF attacks session hijacking

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