Form_Template_Action_Self.php

<!DOCTYPE html>
    <html>
        <!-- This is more advanced now-->
        <head>
        </head>
        <body>
            <form method="" action="<?php htmlspecialchars($_SERVER['PHP_SELF']) ?>">
             
             <input name="" type="submit">
            </form>
            <hr>
            <h1>Output:</h1>
            <?php
            // PHP code here:
            ?>
        </body>
    </html>