Create a MongoDB connection, that later you can query:

$manager = new \MongoDB\Driver\Manager('mongodb://localhost:27017');

In the next example, you will learn how to query the connection object.

This extension close the connection automatically, it's not necessary to close manually.

Example for searching just one user with a specific id, you should do:

$options = ['limit' => 1];
$filter = ['_id' => new \MongoDB\BSON\ObjectID('578ff7c3648c940e008b457a')];
$query = new \MongoDB\Driver\Query($filter, $options);

$cursor = $manager->executeQuery('database_name.collection_name', $query);
$cursorArray = $cursor->toArray();
if(isset($cursorArray[0])) {
    var_dump($cursorArray[0]);
}

Example for searching multiple users with the name "Mike":

$filter = ['name' => 'Mike'];
$query = new \MongoDB\Driver\Query($filter);

$cursor = $manager->executeQuery('database_name.collection_name', $query);
foreach ($cursor as $doc) {
    var_dump($doc);
}

Example for adding a document:

$document = [
    'name' => 'John',
    'active' => true,
    'info' => ['genre' => 'male', 'age' => 30]
];
$bulk = new \MongoDB\Driver\BulkWrite;
$_id1 = $bulk->insert($document);
$result = $manager->executeBulkWrite('database_name.collection_name', $bulk);

Example for updating all documents where name is equal to "John":

$filter = ['name' => 'John'];
$document = ['name' => 'Mike'];

$bulk = new \MongoDB\Driver\BulkWrite;
$bulk->update(
    $filter,
    $document,
    ['multi' => true]
);
$result = $manager->executeBulkWrite('database_name.collection_name', $bulk);

Example for deleting all documents where name is equal to "Peter":

$bulk = new \MongoDB\Driver\BulkWrite;

$filter = ['name' => 'Peter'];
$bulk->delete($filter);

$result = $manager->executeBulkWrite('database_name.collection_name', $bulk);