Conditional for Page template? if ( is_ page template

Oh the reason I am doing it this way is so that I don’t have to touch the PHP every time a ned page is added. Doing a standard if (is_page (‘portfolio’) would make me have to touch the PHP every time a new page is added.

I found this code on a guys site. Gonna see if I can plug in it. Let me know if anyone else has any solutions.

function is_page_template($template = 'portfolio.php') {
	if (!is_page()) {
		return false;
	}

	global $wp_query;

	$page = $wp_query->get_queried_object();
	$custom_fields = get_post_custom_values('_wp_page_template',$page->ID);
	$page_template = $custom_fields[0];

	// We have no argument passed so just see if a page_template has been specified
	if ( empty( $template ) ) {
		if (!empty( $page_template ) ) {
			return true;
		}
	} elseif ( $template == $page_template) {
		return true;
	}

	return false;
}