Php manager container instances

Container.php

<?php

namespace App\Utill;

class Container {

  /**
   * @var Array container instances
   */
  public static $instances = [];
  /**
   * @var String unique container id
   */
  private $id;

  /**
   * Constructor
   * @param String unique id
   * @param Array services
   * @return self
   */
  function __construct (String $id, Array $services = []) 
  {
    $this->id = $id;
    $this->services = $services;
    self::_addInstance($this);
  }

  /**
   * Get an instance
   * @param String id
   * @return Array
   */
  public static function getInstance (String $id)
  {
    if (isset(self::$instances[$id])) 
    {
      return self::$instances[$id];
    }

    return false;
  }

  /**
   * Add a new container to instances
   * @param String id
   * @param Array services
   * @return void
   */
  private static function _addInstance ($instance)
  {
    self::$instances[$instance->id] = $instance;
  }

  /**
   * Get service from container
   * @param String id
   * @param String service name
   * @return Class
   */
  private static function _getService ($id, $service)
  {
    return self::$instances[$id]->services[$service];
  }

  /**
   * Add service to instance
   * @param String id
   * @param Array service
   * @return void
   */
  private static function _addServices ($id, $services)
  {
    foreach ($services as $key => $val) {
      self::$instances[$id]->services[$key] = $val;
    }
  }

  /**
   * Add service to this instance
   * @param Array|String id or services
   * @param Array services (optional)
   * @return self
   */
  public function add ($name, $services = null)
  {
    if (is_array($name)) {
      $services = $name;
      self::_addServices($this->id, $services);
    } else {
      self::_addServices($this->id, [
        $name => $services
      ]);
    }

    return $this;
  }

  /**
   * Get a service from this instance
   * @param String service
   * @return Class
   */
  public function getService ($service)
  {
    return self::_getService($this->id, $service);
  }

}

use App\Utill\Request;
use App\Utill\Pipe;
use App\Utill\Container;
use App\Another;

$url = 'https://google.com/';
$request = new Request();
$pipe = new Pipe();
$another = new Another();

new Container('AppServices', [
  'Request' => $request
]);

$app = Container::getInstance('AppServices');

$app->add([
  'Pipe' => $pipe
]);

$app->add('Another', $another);

$app->getService('Request')->get($url);