class 'MongoDB\Cient' not found - php

Question

I am using the following code to create a connection to a MongoDB server, so as to create databases and stuff but I keep getting class 'MongoDB\Cient' not found. I really need help.
<?php
$client = new MongoDB\Client('mongodb://localhost:27017');
$db = $client->reach;
$collection = $db->messages;
$collection->insertOne($record);
?>
where $record is some record.
Also, $mng = new MongoDB\Driver\Manager("mongodb://localhost:27017"); connects and I can use it to communicated with any already created db (using the command line). So, I want to ask if MongoDB\Driver\Manager can substitute MongoDB\Client?

Answer 1

After all the struggle, this solved the issue...
installing using composer:
$ composer require "mongodb/mongodb=^1.0.0"
OUTPUT:
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Installing mongodb/mongodb (1.0.0)
Downloading: 100%
Writing lock file
Generating autoload files
Usage:
<?php
require 'vendor/autoload.php'; // include Composer goodies
$client = new MongoDB\Client("mongodb://localhost:27017");
$collection = $client->demo->beers;
$result = $collection->insertOne( [ 'name' => 'Hinterland', 'brewery' => 'BrewDog' ] );
echo "Inserted with Object ID '{$result->getInsertedId()}'";
?>
That fixed the issue for me. follow the link:
http://docs.php.net/manual/en/mongodb.tutorial.library.php