Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in php with mongoDB :

Question

I am working on php with MongoDB. On running the below script in wamp server by going to localhost/test.php, it gives the error:

Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in C:\wamp64\www\test.php on line 3

The second error is

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.;C:\php\pear') in C:\wamp64\www\test.php on line 3

I also installed composer by composerSetup.exe. Why it is giving the error?

<?php

require 'vendor/autolod.php';
$client = new Mongo\Client;
$companydb = $client->companydb;
$result1 = $companydb->createCollection('collection1');
var_dump(result1);

?>

while phpinfo() is working fine after running this code.

<?php echo phpinfo(); ?>

Actually I followed this you tube video . He uses XAMP server and run command composer require "mongodb/mongodb=^1.0.0" in xamp/htdocs/projectname/ but I used wampserver and in wamp directory there is no htdocs directory. I think I am making mistake at this point. Is'nt it?