Need help with Mongo Client Connections and PHP 5.6

Hello, I have an urgent problem regarding to the Mongo client connections, I want to understand why is creating a new connection almost all the time. I’ve tried to handling different connections in an array but I still create too many connections. I’m using PHP 5.6 with Mongo 3.6.17 and the mongo php driver is https://github.com/mongodb/mongo-php-driver-legacy.git.

This is the Connect function:

function Connect ($dbName, $dbURI){
       if (!empty($this->connection)) {
		  return; // Avoiding to instantiate a new MongoClient.
        } else {
		 $options = [
			'connect' => true,
			'connectTimeoutMS' => 10000,
		];

		$mongo = new MongoClient(
			$dbURI,
			$options
		);
		
		if ( count( explode( ',', $dbURI ) ) > 1 ) {
			
			$mongo -> setReadPreference( MongoClient::RP_SECONDARY_PREFERRED );
			$this -> replica = true;
			$mongo -> slaveOkay = true;
			
		}
		
		$this -> connection	= $mongo -> $dbName;

As example I have: a Function with $mongoConn = new MyClassMongo($db); after I just use the Find method or any other method to operate with mongo.

Thank you.