php7mongodriver.php

<?php

include_once "vendor/autoload.php";
include_once "src/Adapter.php";
include_once "src/Configs.php";

use MongoDriver\Adapter;
use MongoDriver\Configs;

/**
 * [\MongoDriver\Models\Model(name = "cars")]
 */
class Car
{
    /**
     * [\MongoDriver\Models\Fields\Required]
     * @var string $name
     */
    public $name;

    /**
     * [\MongoDriver\Models\Fields\Ref(model = "Owner", field = "name")]
     * @var string $owner
     */
    public $owner;
}

/**
 * [\MongoDriver\Models\Model(name = "owners")]
 */
class Owner
{
    /**
     * [\MongoDriver\Models\Fields\Required]
     * @var string $name
     */
    public $name;
}

Configs::registerModel("testDB", new Car());
Configs::registerModel("testDB", new Owner());

$adapter = new Adapter();
$adapter->connect("mongodb://localhost:27017");
$adapter->selectDB("testDB");

$find = $adapter->findOne("cars")->populate('owner');

print_r($find);