PHP Warning: json_encode(): Invalid UTF-8 sequence in argument

今天调试代码的时候发现json_encode()报错问题如下描述：

问题代码：

$requestData = json_encode(
   array(
        'wechat_group_name' => $wechat_group_name,
        'text_message' =>$text_message,//该值是中文一个拼接字符串
   )
);

能后报错PHP Warning: json_encode(): Invalid UTF-8 sequence in argument in /home/leyangjun/myshop/leyangjun.php on line 188

原因：变量中包含一些非utf-8字符，需要统一下字符编码

解决：把需要json_encode编码的值转下编码格式：

$requestData = json_encode(
      array(
            'wechat_group_name' => $wechat_group_name,
            'text_message' => mb_convert_encoding($text_message,'UTF-8','UTF-8'),
      )
  );

能后OK解决