rr_code_snippet_1.php

Pokial sa jedna o tento priklad tak connection by som riesil ako sluzbu samostatne a dal by som ju do DI, 
pri registraci do DI by sa nakonfigurovala, naco sa ma stale vytvarat objekt DatabaseConnection staci jedn sluzba.

UserFacade by som tiez dal do DI nech si ju mozem zavolat kde potrebujem a DatabaseConnection si vyziadam, DI sa o to uz postara.

V reale by som asi pouzil doctrinu, lebo ma lepsie riesenu architekturu.
<?php

class DatabaseConnection {

	/** @var  string */
	protected $host;

	/** @var  string */
	protected $user;

	/** @var  string */
	protected $password;

...

	/**
	 * @param string $host
	 * @param string $user
	 * @param string $password
	 */
	public function __construct($host, $user, $password, ...) {
		$this->host = $host;
		$this->user = $user;
		$this->password = $password;
		...
	}

...
}

class UserFacade {

	/** @var  DatabaseConnection */
	protected $databaseConnection;

	/**
	 * @param DatabaseConnection $databaseConnection
	 */
	public function __construct(DatabaseConnection $databaseConnection) {
		$this->databaseConnection = $databaseConnection;
	}

	/**
	 * @param array $orderBy
	 * @return array
	 */
	public function getUsers($orderBy = array()) {
		$results = $this->databaseConnection->query('SELECT name FROM user ORDER BY ' . implode(',', $orderBy));
		return $results;
	}
	
	...
}