kpbackend/api/v1/updateLocation/index.php

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

// Requires the MongoDB PHP Driver
// https://www.mongodb.com/docs/drivers/php/

$client = new Client('mongodb://kpadmin:AnandAyyappan1981@127.0.0.1:27017/?authSource=kpmaster');
$collection = $client->selectCollection('kpmaster', 'kpu');
$return = $collection->updateOne(['_id' => new ObjectId('64b0f61b8b3742ad72109e80')], ['$set' => ['location' => ['coordinates' => [76.7682501,8.73673601],'type'=> "Point"]]]);
printf("Matched %d document(s)\n", $return->getMatchedCount());
printf("Modified %d document(s)\n", $return->getModifiedCount());
?>