Untitled

<html>
    <head>
        <title>Some title</title>
        // Add a PHP 'Placeholder' here to inject some HTML if $filename = BodyInstance.php
    </head>
    <body>
        <?php include('$filename'); // $filename = BodyInstance.php or can be any other php file  ?>
    </body>
</html>

<p>
    This is a dummy body text
    <?php // Inject something into the placeholder of template.php ?>
</p>