index.php

<?php

require_once('classes/render-adminlte.class.php');
$renderAdminLTE=new renderadminlte();

$aReplace=include("./config/page_replacements.php");
$sTemplate=file_get_contents('config/page.tpl.php');

// ---------- send content
echo $renderAdminLTE->render($sTemplate,$aReplace);