You can put this code anywhere in the PHP file. ...
sample1:<div class=<leftblock>
<?php $root = $_SERVER['DOCUMENT_ROOT']; include $root . '/comments.php'; ?>
</div>
sample2:
<?php
echo '<div class=leftblock>';
$root = $_SERVER['DOCUMENT_ROOT']; include $root . '/comments.php';
echo '</div>';
?>
Path to configuration file menage/sett.php
no config.php