FressRSS/app/views/entry/read.phtml

<?php

if (Request::param ('is_read')) {
	Request::_param ('is_read', 0);
} else {
	Request::_param ('is_read', 1);
}

$url = Url::display (array (
	'c' => Request::controllerName (),
	'a' => Request::actionName (),
	'params' => Request::params (),
));

echo json_encode (array ('url' => preg_replace ('#&amp;#i', '&', $url)));