class Street
{
protected $speedLimit;
protected $cars;
public function __construct($speedLimit = 200)
{
$this->cars = array();
// 对变量进行初始化
$this->speedLimit = $speedLimit;
}
protected function isStreetLegal(Car $car)
{
if ($car->getMaximumSpeed() < $this->speedLimit) {
return true;
} else {
return false;
}
}
public function addCar(Car $car)
{
if ($this->isStreetLegal($car)) {
echo 'The Car was allowed on the road.';
$this->cars[] = $car;
} else {
echo 'The Car is too fast and was not allowed on the road';
}
}
}
$street = new Street();
$street->addCar(new FastCar());
public function __construct($speedLimit = 200)
{
$this->cars = array();
$this->speedLimit = $speedLimit;
}
public function isStreetLegal($car)
{
if ($car instanceof ISpeedInfo) {
if ($car->getMaximumSpeed() < $this->speedLimit) {
return true;
} else {
return false;
}
} else {
// 扩展类必须实现ISpeedInfo才能使street合法
return false;
}
}
public function addCar($car)
{
if ($this->isStreetLegal($car)) {
echo 'The Car is was allowed on the road';
$this->cars[] = $car;
} else {
echo 'The Car is too fast and was not allowed on the road';
}
}
}
$street = new Street();
$street->addCar(new Car());
