微信 用户基本信息接口 返回数据php_decode 返回null

Question

{"user_info_list":[{"subscribe":1,"openid":"oXd_Ftx6jQ7MMMOitkfjM9KQUTnQ","nickname":"Grace 阿欢","sex":2,"language":"zh_CN","city":"U\q","province":"l³S","country":"","headimgurl":"http://wx.qlogo.cn/mmopen/ajNVdqHZLLDcN5f9gjLJMpnHYJuRbJVeBsMibByNHsyuUCLEBEWGhhlH5EkvzGLibN7ic3TMDUVOnkHOBJLf8mZGQ/0","subscribe_time":1465995165,"remark":"","groupid":0,"tagid_list":[]}]}

是因为city 和 province中含有特殊字符？如何处理？

Answer 1

   json_decode($string);//看具体是什么错误
    switch (json_last_error()) {
        case JSON_ERROR_NONE:
            echo ' - No errors';
        break;
        case JSON_ERROR_DEPTH:
            echo ' - Maximum stack depth exceeded';
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo ' - Underflow or the modes mismatch';
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo ' - Unexpected control character found';
        break;
        case JSON_ERROR_SYNTAX:
            echo ' - Syntax error, malformed JSON';
        break;
        case JSON_ERROR_UTF8:
            echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
        break;
        default:
            echo ' - Unknown error';
        break;
    }
    

Answer 2

 $string = '{"user_info_list":[{"subscribe":1,"openid":"oXd_Ftx6jQ7MMMOitkfjM9KQUTnQ","nickname":"Grace 阿欢","sex":2,"language":"zh_CN","city":"U\q","province":"l³S","country":"","headimgurl":"http://wx.qlogo.cn/mmopen/ajNVdqHZLLDcN5f9gjLJMpnHYJuRbJVeBsMibByNHsyuUCLEBEWGhhlH5EkvzGLibN7ic3TMDUVOnkHOBJLf8mZGQ/0","subscribe_time":1465995165,"remark":"","groupid":0,"tagid_list":[]}]}';

$str = str_replace('\\','\\\\',$string);

 $result = json_decode($str, true);
 var_dump($result);