PHP解决某些特殊汉字符或汉字转码后成乱码或者空白的问题

    function sendService($object, $access_token)
    {
        /* 获得openId值 */
        $openid = (string)$object->FromUserName;
        $post_data = array(
            'touser'    => $openid,
            'msgtype'   => 'text',
            'text'      => array(
                            'content'   => '这是客服自动回复的消息'
                        )
        );
        $url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=" . $access_token;
        curlPost($url, json_encode($post_data, JSON_UNESCAPED_UNICODE));
    }
    function curlPost($url, $post_data)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_URL, $url);
        // post数据
        curl_setopt($ch, CURLOPT_POST, 1);
        // post的变量
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
        $response = curl_exec($ch);
        curl_close($ch);
        //-------请求为空
        if(empty($response)){
            exit("50001");
        }
        return $response;
    }