[WordPress] Posts-per-Cat Template in Theme Template File

<?php
$ppc_code = '[ppc]
<div class="article">
<div class="thumbnail"><a href="%link%">%thumbnail%</a></div>
<div class="title"><a href="%link%">%title%</a></div>
<div class="excerpt">%excerpt%</div>
</div>
[/ppc]';

echo do_shortcode( $ppc_code );
?>