// describe interfate of engine
interface IEngine {
public function getAcceleration();
public function getPower();
}
// abstract implementation of engine
abstract class Engine implements IEngine {
/**
* Engine acceleration
*/
protected $_acceleration = 0;
/**
* Engine power (h/p)
*/
protected $_power = 0;
public function getAcceleration() {
return (int) $this->_acceleration;
}
public function getPower() {
return (int) $this->_power;
}
}
// extending from engine implementation
class V12 extends Engine{
protected $_acceleration = 0.0005;
protected $_power = 300;
}
// describe interface of the car
interface ICar {
public function setEngine(IEngine $engine);
public function accelerate();
}
// abstract implementation of engine
abstract class Car {
/**
* Engine of the car
* @var IEngine
*/
protected $_engine;
/**
* Speed of the car
* @var Float
*/
protected $_speed = 0;
public function setEngine(IEngine $engine){
$this->_engine = $engine;
}
public function accelerate() {
if( ! ($this->_engine instanceof IEngine)){
throw new Exception("Wrong type of engine");
}
$this->_speed += $this->_engine->getAcceleration();
}
}
class MyCar extends Car {
public function __construct(){
$this->setEngine(new V12());
}
}
$car = new MyCar();
$car->accelerate();
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