I have been working on one of my android project and today I am facing an error. Here I am trying to update some values in table through php. But I am getting error like “E/Volley: [17118] NetworkUtility.shouldRetryException: Unexpected response code 500” . I am using volley library in android with java language.

Here is my php code :

 `<?php
      $qid = $_POST['qId'];
    $ans = $_POST['ans'];
   include "W_config.php";

   $sql="SELECT * FROM `$db`.`user_ques` WHERE `id`= 49";
    $result=mysqli_query($conn,$sql);
   if(mysqli_num_rows($result)>0){

    while($row=mysqli_fetch_array($result)){


   $answer = $row['7'];




   if($ans == 0){
    
    $new = $answer-1;
     $sql="UPDATE `$db`.`user_ques` SET  `answers`='{$new}'  WHERE `id`= 49";
     $result=mysqli_query($conn,$sql) or die("result failed");

     //echo "yes";
    }else{
    
     $new = $answer+1;
     $sql="UPDATE `$db`.`user_ques` SET  `answers`='{$new}'  WHERE `id`= 49";
     $result=mysqli_query($conn,$sql) or die("result failed");

     //echo "no";
  }



  }

  }

?>`

Here the strange thing is that when I am commenting the if else part it is working fine and if I am directly running it on browser then also it is working fine but when connected with android project it is not working .

Here is my java code

    `public void updateQuesAnsNo(int ans){


    final String proIdd = String.valueOf(qId);
    final String ansType = String.valueOf(ans);

          StringRequest request = new StringRequest(Request.Method.POST, url7, new                          

          Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
           progressDialog.dismiss();
            getAnswers(page);
            SharedPreferencelogin session = new SharedPreferencelogin(questionDetailPage.this);
            int sessionId = session.getSession();

            getUserDetails(proUserId);

            if(sessionId != proUserId){
                addAnsNotification();
            }


        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    })
    {
        @Override
        protected Map<String, String> getParams() {
            Map<String,String> map=new HashMap<String, String>();
            map.put("qId",proIdd);
            map.put("ans",ansType);

            return map;
        }
    };
    RequestQueue queue = Volley.newRequestQueue(questionDetailPage.this);
    queue.add(request);

   }`

Here this function is also correct as I have tested it with another url and it is working fine. Please solve it.`

I was trying to update the values in table but is is giving me error like “E/Volley: [17118] NetworkUtility.shouldRetryException: Unexpected response code 500”