PHP CURL 检测远程文件是否在

function curl_file_exist($url)
    {
        $ch = curl_init();
        try {
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HEADER, 1);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
            $contents = curl_exec($ch);
            if (preg_match("/404/", $contents)) return false;
            if (preg_match("/403/", $contents)) return false;
            return true;
        } catch (\Exception $e) {
            return false;
        }
    }