CURL请求函数方法

/**
 * CURL请求
 * @param $url 请求url地址
 * @param $method 请求方法 get post
 * @param null $postfields post数据数组
 * @param array $headers 请求header信息
 * @param bool|false $debug  调试开启 默认false
 * @return mixed
 */
/*
 function curl($url, $method, $postfields = null, $headers = array("Content-type:application/json;charset='utf-8'"), $debug = false) {
    $method = strtoupper($method);
    $postfields=json_encode($postfields);
    $ci = curl_init();
    // Curl settings 
    curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
    curl_setopt($ci, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0");
    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 60); //在发起连接前等待的时间，如果设置为0，则无限等待 
    curl_setopt($ci, CURLOPT_TIMEOUT, 7);//设置cURL允许执行的最长秒数 
    curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);
    switch ($method) {
        case "POST":
            curl_setopt($ci, CURLOPT_POST, true);
            if (!empty($postfields)) {
                $tmpdatastr = is_array($postfields) ? http_build_query($postfields) : $postfields;
                curl_setopt($ci, CURLOPT_POSTFIELDS, $tmpdatastr);
            }
            break;
        default:
            curl_setopt($ci, CURLOPT_CUSTOMREQUEST, $method); //设置请求方式 
            break;
    }
    $ssl = preg_match('/^https:\/\//i',$url) ? TRUE : FALSE;
    curl_setopt($ci, CURLOPT_URL, $url);
    if($ssl){
        curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求 不验证证书和hosts
        curl_setopt($ci, CURLOPT_SSL_VERIFYHOST, FALSE); // 不从证书中检查SSL加密算法是否存在
    }
    //curl_setopt($ci, CURLOPT_HEADER, true); //启用时会将头文件的信息作为数据流输出
    curl_setopt($ci, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ci, CURLOPT_MAXREDIRS, 2);//指定最多的HTTP重定向的数量，这个选项是和CURLOPT_FOLLOWLOCATION一起使用的
    curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ci, CURLINFO_HEADER_OUT, true);
    //curl_setopt($ci, CURLOPT_COOKIE, $Cookiestr); //COOKIE带过去
    $response = curl_exec($ci);
    $requestinfo = curl_getinfo($ci);
    $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);
    if ($debug) {
        echo "=====post data======\r\n";
        var_dump($postfields);
        echo "=====info===== \r\n";
        print_r($requestinfo);
        echo "=====response=====\r\n";
        print_r($response);
    }
    curl_close($ci);
    return $response;
	//return array($http_code, $response,$requestinfo);
}