$current_user = RequestContext::getMain()->getUser();

$wgHooks['SkinAfterContent'][] = function(&$data, $skin) {
    $user = $skin->getUser();
    if (!$user->isRegistered()) {
	$data = '<div class="gas-bottom">';
	$data .= '<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>';
        $data .= '<ins class="adsbygoogle gas-bottom-first"
            style="display:table; width:728px; height:90px; margin:1em auto; clear:both;"
            data-ad-client="ca-pub-####################"
            data-ad-slot="#########"></ins>';
	$data .= '<script>
        (adsbygoogle = window.adsbygoogle || []).push({});
        </script>';
	$data .= '</div>';
        return true;
    }
}; 

$wgHooks['SkinAfterPortlet'][] = function($skin, $portletName, &$html) {
    $user = $skin->getUser();
    if (!$user->isRegistered() && $portletName === "tb") {
        $html = <<< EOT
	<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
		<ins class="adsbygoogle"
		     style="display:inline-block;width:160px;height:1000px;margin:20px 0 0 -20px;"
		     data-ad-client="ca-pub-#############"
		     data-ad-slot="##########"
		</ins>
	<script>
		(adsbygoogle = window.adsbygoogle || []).push({});
	</script>
	EOT;
	
        return true;
    }
};