如何在来自Android JSON Post Volley的PHP中解码JSON

Question

Gooday sorry for my bad english and a newbie in programming. I'm trying to decode a JSONObject thrown from an android volley JSON POST. Right now I'm able to received from the Android the response from the server and I can confirm that thru TOAST. My question is how to properly decode JSON from the server side using PHP. This JSON data will be use for inserting new data in MySQL. I just don't know the proper way and having hard time finding out the answer for the decoding setup for this. Please can you give any advice here.

public void testOrder (ArrayList<String> order_id,
                                      ArrayList<String> uname,
                                      ArrayList<String> prod_name,
                                      ArrayList<String> prod_id,
                                      ArrayList<String> quantity,
                                      ArrayList<String> branches,
                                      ArrayList<String> totalPrice,
                                      int itemIteration){
        JSONObject obj = null;
        JSONArray jsonArray = new JSONArray();
        final JSONObject finalobject = new JSONObject();
        for (int i = 0; i < itemIteration; i++) {
            obj = new JSONObject();
            Log.d("OBJECT_COUNTER", String.valueOf(i));
            try {
                obj.put("order_id",  order_id.get(i));
                Log.d("ORDER_ID",    order_id.get(i));
                obj.put("uname",     uname.get(i));
                Log.d("USERNAME",    uname.get(i));
                obj.put("prod_name", prod_name.get(i));
                Log.d("PROD_NAME",   prod_name.get(i));
                obj.put("quantity",  quantity.get(i));
                Log.d("PROD_QUANT",  quantity.get(i));
                obj.put("branch",    branches.get(i));
                Log.d("PROD_BRANCHES", branches.get(i));
                obj.put("totalPrice",  totalPrice.get(i));
                Log.d("TOTAL_PRICE",   totalPrice.get(i));
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            jsonArray.put(obj);
        }
            try {
                finalobject.put("ORDER_LIST", jsonArray);
                test = jsonArray.toString();
//                Toast.makeText(this,test,Toast.LENGTH_SHORT).show();
            } catch (JSONException e) {
                e.printStackTrace();
            }

        StringRequest strRequest = new StringRequest(Request.Method.POST, Config.TRY_JSON_POST,
                new Response.Listener<String>()
                {
                    @Override

                    public void onResponse(String response)
                    {
                        Toast.makeText(PlaceOrder.this, response, Toast.LENGTH_SHORT).show();
//                       
                    }
                },
                new Response.ErrorListener()
                {
                    @Override
                    public void onErrorResponse(VolleyError error)
                    {
                        Toast.makeText(PlaceOrder.this, error.toString(), Toast.LENGTH_SHORT).show();
                    }
                })
        {
            @Override
            protected Map<String, String> getParams()
            {
                Map<String, String> params = new HashMap<>();
                params.put("tag", finalobject.toString());
//                String obj = finalobject.toString();
//                Toast.makeText(PlaceOrder.this,obj,Toast.LENGTH_SHORT).show();
                return params;
            }
        };
        AppController.getmInstance().addToRequesQueue(strRequest);
    }
}

PHP CODE

<?php 
if($_SERVER['REQUEST_METHOD']=='POST'){

$response = array("ORDERLIST" => $_POST["tag"]);
//$response = array($_POST["tag"]);
//$my_array = json_decode($response,true);

echo json_encode(str_replace('\"','"',$response));

     echo "RECEIVED";

} else{

       echo "nothing";
}

I use Log.d for the response:

D/Response:

{"ORDERLIST":"{\"ORDER_LIST\":[{\"order_id\":\"1755\",\"uname\":\"jordan\",\"prod_name\":\"ABC\",\"quantity\":\"1\",\"branch\":\"Dapitan\",\"totalPrice\":\"23500\"},{\"order_id\":\"1755\",\"uname\":\"jordan\",\"prod_name\":\"AMD Kaveri A4-7300 APU HD8470D 2-Core 2GB 500GB CPU Package\",\"quantity\":\"1\",\"branch\":\"Dapitan\",\"totalPrice\":\"23500\"}]}"}

After using echo $content this is displayed on my toast

D/Response: DATA:tag=%7B%22ORDER_LIST%22%3A%5B%7B%22order_id%22%3A%221755%22%2C%22uname%22%3A%22jordan%22%2C%22prod_name%22%3A%22ABC%22%2C%22quantity%22%3A%221%22%2C%22branch%22%3A%22Dapitan%22%2C%22totalPrice%22%3A%2223500%22%7D%2C%7B%22order_id%22%3A%221755%22%2C%22uname%22%3A%22jordan%22%2C%22prod_name%22%3A%22AMD+Kaveri+A4-7300+APU+HD8470D+2Core+2GB+500GB+CPU+Package%22%2C%22quantity%22%3A%221%22%2C%22branch%22%3A%22Dapitan%22%2C%22totalPrice%22%3A%2223500%22%7D%5D%7D&

edited PHP code

if($_SERVER['REQUEST_METHOD']=='POST'){

$content   = file_get_contents( "php://input" );
$response  = json_decode($content,TRUE);
$orderlist = json_decode($response['ORDER_LIST'], TRUE);

//echo $orderlist[0][order_id][0];

echo "DATA: ";

foreach($orderlist AS $row ){
  echo $row[uname];
} 

      echo $response;
} else{
      echo "nothing";
}

Answer 1

(Edited)

Try this:

$content   = file_get_contents( "php://input" );
$response  = json_decode( $content, TRUE );
$orderlist = json_decode( $response['ORDERLIST'], TRUE );

From the PHP Documentation:

php://input is a read-only stream that allows you to read raw data from the request body. In the case of POST requests, it is preferable to use php://input instead of $HTTP_RAW_POST_DATA as it does not depend on special php.ini directives.

After decoding json data, you obtain in $orderlist an associative array. You can now choose to save to the database the array values you prefer.

So (ie): $orderlist[0][order_id] or $orderlist[1][uname]