MongoDB: Fatal error: Class ‘MongoClient’ not found

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TL;DR

The class MongoClient is part of the legacy PECL package mongo but not anymore of the up-to-date mongodb package.

And since you have the mongodb extension installed, and not the mongo one, this is why you are getting the error

Fatal error: Class 'MongoClient' not found

On MongoDB PHP driver github repo, the release note about the version 1.0.0, is suggesting developers to use MongoDB\Driver\Manager instead of MongoClient

Changes from our legacy mongo extension

Most significantly, the legacy driver’s MongoClient, MongoDB, and
MongoCollection classes have been obsoleted by the
MongoDB\Driver\Manager class, which is the new gateway for connecting
and executing queries, commands, and write operations.

Source:: https://github.com/mongodb/mongo-php-driver/releases/tag/1.0.0

So, here is the replacement class documentation and the snippet of code that should replace yours :

$m = new MongoDB\Driver\Manager("mongodb://localhost:27017");

As the documentation is prompting it, the class is deprecated.

Warning This extension that defines this class is deprecated. Instead,
the MongoDB extension should be used. Alternatives to this class
include:

Source: http://php.net/MongoClient

From what I read on their github repository release history, the class you are trying to use have been obsoleted since the version of mongodb 1.0.0, so, on the version 1.6.0 you are, this class is not even part of the dll anymore.

That is confirmed by this issue on their github

derickr commented on Apr 16

MongoClient is a class from the old legacy
driver and is not supposed to be available in this one. The new driver
has \MongoDB\Driver\Manager, and, the accompanying library has
\MongoDB\Client.

You either need to install the old legacy extension (pecl install
mongo) and use PHP 5.x, or update your code to use this new driver’s
classes as the old driver is not available for PHP 7. There is an
upgrade guide at
http://mongodb.github.io/mongo-php-library/upgrade-guide/

Source: https://github.com/mongodb/mongo-php-driver/issues/300#issuecomment-210820288

Another way, as suggested by the MongoDB member quoted here above is to use this pecl extension: https://pecl.php.net/package/mongo instead of https://pecl.php.net/package/mongodb but please also notice the warning there stating:

This package has been superseded, but is still maintained for bugs and security fixes.

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