MongoDB connection using PHP Driver - Fatal Error Class ‘MongoDB\Driver\Manager’

Question

I am trying to connect MongoDB to my Wordpress via PHP native driver. I am working on macOS Monterey version 12.6 and PHP version 8.1.10.

Following MongoDB's documentation I have installed all prerequisites:

1. Installed php extension using pecl install mongodb
2. Added extension=mongodb.so to the php.ini file
3. Installed MongoDB Library using composer require mongodb/mongodb in the root project directory

I then tried to connect to Atlas using the following code (note: I replaced the inputs db, password, and cluster in the actual code):

<?php

require_once __DIR__ . '/vendor/autoload.php';

$client = new MongoDB\Client(
    'mongodb+srv://<my-database>:<my-password>@<my-cluster>.lkffbtl.mongodb.net/?retryWrites=true&w=majority');

var_dump( $client );

After running this code, I receive a fatal error:

Fatal error: Uncaught Error: Class 'MongoDB\Driver\Manager' not found in /home3/coradase/public_html/cora-staging/wp-content/plugins/MongoDB/vendor/mongodb/mongodb/src/Client.php:124 Stack trace: #0 /home3/coradase/public_html/cora-staging/wp-content/plugins/MongoDB/conf.php(6): MongoDB\Client->__construct('mongodb+srv://c...') #1 /home3/coradase/public_html/cora-staging/wp-content/plugins/MongoDB/mongodb.php(28): require_once('/home3/coradase...') #2 /home3/coradase/public_html/cora-staging/wp-includes/class-wp-hook.php(307): cora_mongodb_admin_page('') #3 /home3/coradase/public_html/cora-staging/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array) #4 /home3/coradase/public_html/cora-staging/wp-includes/plugin.php(476): WP_Hook->do_action(Array) #5 /home3/coradase/public_html/cora-staging/wp-admin/admin.php(259): do_action('toplevel_page_c...') #6 {main} thrown in /home3/coradase/public_html/cora-staging/wp-content/plugins/MongoDB/vendor/mongodb/mongodb/src/Client.php on line 124

This error seems to stem from the Client.php file that was installed as a part of the MongoDB Library through composer. Within Client.php, line 124 (referenced in the error) is contained in the following function:

public function __construct($uri = 'mongodb://127.0.0.1/', array $uriOptions = [], array $driverOptions = [])
    {
        $driverOptions += ['typeMap' => self::$defaultTypeMap];

        if (! is_array($driverOptions['typeMap'])) {
            throw InvalidArgumentException::invalidType('"typeMap" driver option', $driverOptions['typeMap'], 'array');
        }

        if (isset($driverOptions['autoEncryption']['keyVaultClient'])) {
            if ($driverOptions['autoEncryption']['keyVaultClient'] instanceof self) {
                $driverOptions['autoEncryption']['keyVaultClient'] = $driverOptions['autoEncryption']['keyVaultClient']->manager;
            } elseif (! $driverOptions['autoEncryption']['keyVaultClient'] instanceof Manager) {
                throw InvalidArgumentException::invalidType('"keyVaultClient" autoEncryption option', $driverOptions['autoEncryption']['keyVaultClient'], [self::class, Manager::class]);
            }
        }

        $driverOptions['driver'] = $this->mergeDriverInfo($driverOptions['driver'] ?? []);

        $this->uri = (string) $uri;
        $this->typeMap = $driverOptions['typeMap'] ?? null;

        unset($driverOptions['typeMap']);

        $this->manager = new Manager($uri, $uriOptions, $driverOptions);
        $this->readConcern = $this->manager->getReadConcern();
        $this->readPreference = $this->manager->getReadPreference();
        $this->writeConcern = $this->manager->getWriteConcern();
    }

Line 124 specifically is:

$this->manager = new Manager($uri, $uriOptions, $driverOptions);

Again, this code comes directly from the composer installation of MongoDB Library, and has not been edited.

I appreciate any insight in trying to debug so that the code will properly establish the connection to the database.

Thank you!