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Factory and DI example

View factory_di
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<?php
class Car
{
protected $power;
protected $doors;
 
public static function factory($type, Engine $engine, Transmission $transmission)
{
$instance = null;
switch ($type) {
case 2:
$instance = new Sedan($engine, $transmission);
break;
case 4:
$instance = new Crossover($engine, $transmission);
break;
default:
throw new Exception('Invalid type');
}
 
return $instance;
}
 
public function __construct(Engine $engine, Transmission $transmission)
{
$this->engine = $engine;
$this->transmission = $transmission;
}
}
 
class Sedan extends Car
{
// implementation
}
 
class Crossover extends Car
{
// implementation
}
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