function main(ujn_controller $c, $params = '')

求解这个函数用法，问$c 是不是等于ujn_controller这个类？是不是相当于 ujn_controller这个对象？
function main(ujn_controller $c, $params = '') {
$puid = auth($c);

blockade($puid); //封号 $c->assign(array(
'http_pre' => HTTP_PRE,
    'url_static_js'   => URL_STATIC_JS,
    'url_static_img' => URL_STATIC_IMG,
'url_root'          => URL_ROOT,
   'ver_js' => VER_JS,
    'make_cfg'        => make_cfg($puid),
)); return $c;
}