Can not send string to php file using namevaluepair - php

Question

I am trying to send a string to php script using namevaluepair. But i couldn't receive it on the other side. Here is my code.
protected String doInBackground(String... args) {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("Username",code ));
Log.v("username", code);
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://192.168.42.21:8080/sellapp/menuitem.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
// Oops
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish {}
}
return result;
}
Here i want to pass the value in the string code to my php script. my php script is
$con = mysqli_connect(HOST,USER,PASS,DB);
$cst_id=$_REQUEST['Username'];
// $cst_id= 'cus02';
$sql = "
select
cust_code, segment_type, cust_name, cust_address, cust_payment_type, cust_credit_limit, cust_cr_balance
from customer where cust_code='".$cst_id."'
";
$res = mysqli_query($con,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push(
$result,
[
'cust_id'=>$row[0],
'cust_seg'=>$row[1],
'cust_name'=>$row[2],
'cust_type'=>$row[3],
'cust_ad'=>$row[4],
'cust_cr'=>$row[5],
'cust_bl'=>$row[6]
]
);
}
echo json_encode(array("result"=>$result));
mysqli_close($con);
When I am giving the value directly to the php it works. But through name/value pair it returns a null array as result.
Please help me to get an answer.I tried questions related to it. But didn't worked.

Answer 1

<?php
$con = mysqli_connect(HOST,USER,PASS,DB);
$cst_id = $_POST['Username']; // --------- not $_REQUEST['Username'];
// $cst_id= 'cus02';
$sql = "select cust_code,segment_type,cust_name,cust_address,cust_payment_type,cust_credit_limit,cust_cr_balance from customer where cust_code='".$cst_id."' ";
$res = mysqli_query($con,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push($result,
['cust_id'=>$row[0],
'cust_seg'=>$row[1],
'cust_name'=>$row[2],
'cust_type'=>$row[3],
'cust_ad'=>$row[4],
'cust_cr'=>$row[5],
'cust_bl'=>$row[6]
]);
}
//echo json_encode(array("result"=>$result));
echo json_encode($result);
mysqli_close($con);
?>