<?php
    session_start();
?>
<!DOCTYPE html>
<html lang="de">
    <head>
        <meta charset="utf-8">
        <title>Session</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <h1>In einer Sitzung</h1>
        <?php print_r($_SESSION); ?>
    </body>
</html>