Set layout from route param.

route-layouts.php

<?php
    public function onBootstrap(MvcEvent $e)
    {
        $em = $e->getApplication()->getEventManager();
        $em->attach('dispatch', array($this, 'chooseLayout'));
    }

    public function chooseLayout(MvcEvent $e)
    {
        $matches      = $e->getRouteMatch();
        $layoutScript = $matches->getParam('layout');
        if ($layoutScript) {
            $e->getViewModel()->setTemplate($layoutScript);
        }
    }