debug layout inside template/view in magento

foo.php

<?php
$req  = Mage::app()->getRequest();
error_log(sprintf(
    "\nRequest: %s\nFull Action Name: %s_%s_%s\nHandles:\n\t%s\nUpdate XML:\n%s",
    $req->getRouteName(),
    $req->getRequestedRouteName(),      //full action name 1/3
    $req->getRequestedControllerName(), //full action name 2/3
    $req->getRequestedActionName(),     //full action name 3/3
    implode("\n\t", $this->getLayout()->getUpdate()->getHandles()),
    $this->getLayout()->getUpdate()->asString()
));
?>