Пример шаблона проектирования Абстрактная фабрика на PHP
<?php
/*
* Abstract Factory classes
*/
abstract class DB_Abstraction_Factory {
protected $settings = array();
protected function __construct() {
$this->settings = Settings::getInstance();
}
abstract public function createInstance();
}
class DB_Abstraction_Factory_ADODB extends DB_Abstraction_Factory {
public function __construct() {
parent::__construct();
}
public function createInstance() {
require_once('/path/to/adodb_lite/adodb.inc.php');
$dsn = $this->settings['db.dsn'];
$db = ADONewConnection($dsn);
return $db;
}
}
class DB_Abstraction_Factory_MDB2 extends DB_Abstraction_Factory {
public function __construct() {
parent::__construct();
}
public function createInstance() {
require_once 'MDB2.php';
$dsn = $this->settings['db.dsn'];
$db = MDB2::factory($dsn);
return $db;
}
}
class DB_Abstraction_AbstractFactory {
public static function getFactory() {
$settings = Settings::getInstance();
switch($settings['db.library'])
{
case 'adodblite':
$factory = new DB_Abstraction_Factory_ADODBLITE();
break;
case 'mdb2';
$factory = new DB_Abstraction_Factory_MDB2();
break;
}
return $factory;
}
}
/*
* Client's code
*/
// instantiate Abstract Factory
$abstractfactory = new DB_Abstraction_AbstractFactory();
// fetch a concrete Factory (decision handled in Abstract Factory static method)
$factory = $abstractfactory::getFactory();
// use concrete Factory to create a database connection object from
// the selected database abstraction library
$db = $factory->createInstance();
?>
