消息：count()：参数必须是在centos上实现Countable codeigniter的数组或对象

Question

查看我的查询

Select * from join_chat where
(user_1 = '24' and user_2 = '26') or
(user_1 = '26' and user_2 = '24')

请通过我的 api 提供解决此错误的建议

<h4>A PHP Error was encountered</h4>

<p>Severity: Warning</p>


</div>{"responce":true,"data":"20"}

2020-05-09 23:16:43.302 28439-30249/techline.carsapp W/System.err: org.json.JSONException: java.lang.String 类型的值选择无法转换为 JSONObject 2020-05-09 23:16:43.302 28439-30249/techline.carsapp W/System.err: 在 org.json.JSON.typeMismatch(JSON.java:112) 2020-05-09 23:16:43.302 28439-30249/techline.carsapp W/System.err：在 org.json.JSONObject.(JSONObject.java:163) 2020-05-09 23:16:43.302 28439-30249/techline.carsapp W/System.err：在 org.json.JSONObject.(JSONObject.java:176) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err: 在 util.CommonAsyTask.doInBackground(CommonAsyTask.java:104) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err: 在 util.CommonAsyTask.doInBackground(CommonAsyTask.java:23) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err: 在 android.os.AsyncTask$2.call(AsyncTask.java:333) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err: 在 java.util.concurrent.FutureTask.run(FutureTask.java:266) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err：在 android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err：在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err：在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 2020-05-09 23:16:43.303 28439-30249/techline.carsapp W/System.err: at java.lang.Thread.run(Thread.java:764)

消息：count()：参数必须是数组或者实现了Countable的对象

文件名：controllers/Api.php

行号：801

    <p>Backtrace:</p>

下面控制器中的方法

public function send_chat_data()
{
    $this->load->library('form_validation');
    $this->form_validation->set_rules('join_id', 'join_id', 'trim|required');
    $this->form_validation->set_rules('sender_id', 'sender_id', 'trim|required');
    $this->form_validation->set_rules('message', 'message', 'trim|required');

    if ($this->form_validation->run() == false) {
        $data["responce"] = false;
        $data["error"] = 'join id is required';
    } else {
        $post_date=date("Y-m-d m:i:s");
        $send_chat = array(
                               "join_id"=>$this->input->post("join_id"),
                               "sender_id"=>$this->input->post("sender_id"),
                               "message"=>$this->input->post("message"),
                               "created_date"=>$post_date
                               );

        $this->db->insert("chat", $send_chat);
        $insertid = $this->db->insert_id();

        $q = $this->db->query("Select * from join_chat where join_id= '".$this->input->post("join_id")."' limit 1");
        $recever_id = 0;
        $row = $q->row();
        if ($row->user_1 == $this->input->post("sender_id")) {
            $recever_id = $row->user_2;
        } else {
            $recever_id = $row->user_1;
        }
        $q2 = $this->db->query("Select * from chat where chat_id= '".$insertid."' limit 1");


        $chat = $q2->row();
        $data["responce"] = true;
        $data["data"] = $chat;



        $q_fcm = $this->db->query("Select * from users where user_id= '".$recever_id."' limit 1");
        $row_fcm = $q_fcm->row();

        $registatoin_ids =$row_fcm->user_gcm_code;


        $message["title"] = $this->config->item('app_name');
        $message["message"] = $this->input->post("message");
        $message["image"] = "";
        $message["created_at"] = date("Y-m-d h:i:s");
        $message["obj"] = $chat;

        $this->load->helper('gcm_helper');
        $gcm = new GCM();
        //$result = $gcm->send_topics("/topics/rabbitapp",$message ,"ios");

        $result = $gcm->send_notification(array($registatoin_ids), $message, "android");
    }
    echo json_encode($data);
}

错误来自下面的行

$row = $q->row();

Answer 1

我看到的问题是您正在尝试计算非数组或不可数对象。

想法

1. 在您的整个代码中，您还没有编写count()，这似乎 导致问题，为什么？
   
2. 当您限制 结果给自己 1 // as you said the problem is here $row = $q->row();
   

可能的解决方案

当您使用row() 即$q->row(); 时，您会得到non-countable object，

// row() dummy data
stdClass Object
(
    [id] => 15
    [event_id] => 3
    [event_image] => c1fa8a5d5505047251fd928aa312b16c.jpg
)

但是当你使用result() 即$q->result(); 时，它会产生一个对象数组，或者在result_array() 的情况下，一个数组数组，即使你将它们限制为一个。

// result() dummy data -- same as result_object()
(
    [0] => stdClass Object
        (
            [id] => 15
            [event_id] => 3
            [event_image] => c1fa8a5d5505047251fd928aa312b16c.jpg
        )

)

// result_array() dummy data
Array
(
    [0] => Array
        (
            [id] => 15
            [event_id] => 3
            [event_image] => c1fa8a5d5505047251fd928aa312b16c.jpg
        )

)

它们现在都是一个数组，因此是可数的。

因此，如果您必须计算，请使用 $q->result();
另外，如果您想计算 计算“结果”$q->row(); 的数量，您可以使用
count((array) ($q->row()));
这将在此处返回 3。 {id}, {event_id}, {event_image}。阅读更多关于它的信息here

希望对你有所帮助。