kpbackend/mdb/index.php

<?php
require_once("./vendor/autoload.php");
use MongoDB\Client;

$client = new Client('mongodb://kpadmin:AnandAyyappan1981@127.0.0.1:27017/?authSource=kpmaster');
$collection = $client->selectCollection('kpmaster', 'kpu');
$cursor = $collection->find(['location' => ['$geoWithin' => ['$centerSphere' => [[76.93414657, 8.82302903], 500 / 3963.2]]]]);
// foreach ($cursor as $document) {
//     echo $document["_id"] . "\n";
//  }
 echo json_encode(iterator_to_array($cursor));
?>