[Solved] Getting a value of button like in this example [closed]

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There are numerous tutorials out there … This could be as simple as:

<?php if(isset($_GET['subject'])): ?>
    <?= 'You chose: ' . $_GET['subject']; ?>
<?php else: ?>
<html>
    <body>
        <form method="get" action="<?= $_SERVER['PHP_SELF']; ?>">
            Choose your favorite subject:
            <button type="submit" name="subject" value="fav_HTML">HTML</button>
            <button type="submit" name="subject" value="fav_CSS">CSS</button>
        </form>
    </body>
</html>
<?php endif; ?>

solved Getting a value of button like in this example [closed]