php获取网址301之后的网址

private function getUrlFunc($url)
    {
        $ch=  curl_init($url);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
        curl_setopt($ch, CURLOPT_NOBODY, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_exec($ch);
        $url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
        return $url;
    }