I have a database in phpmyadmin panel. And I want to see this databases as json format. When I paste my link to <http://jsonlint.com/>. It says Null. What's wrong with my php script? 

```
<?php

$host = "**";
$user = "**";
$password = "**";
$db = "**";

$sql = "select * from product_info;";
$con = mysqli_connect($host,$user,$password,$db);

$result = mysqli_query($con,$sql);
$response = array();

while($row = mysqli_fetch_array($result)){
    array_push($response,array("name"=>$row[0],"email"=>$row[1],"mobile"=>$row[2]));
}

echo json_encode(array("server_response"=>$respose));
mysqli_close($con);

?>

```