PHP executed inside of HTML comment

<div class="add-to-cart">
    <!--
    <?php $buttonTitle = $this->__('Add to Cart'); ?>
    <button type="button" title="<?php echo $buttonTitle ?>" class="button btn-cart" onclick="productAddToCartForm.submit(this)">
        <span><span><?php echo $buttonTitle ?></span></span>
    </button>
    -->
    <a class="button" href="<?php echo $producturl ?>">
        <?php echo $this->__('Show Product'); ?>
    </a>
</div>