依赖倒转

依赖的三种写法:

构造函数传递依赖对象

interface IDriver {
    public function drive();
}
 
interface ICar {
    public function run();
}
 
class Driver implements IDriver {
    protected $car;
 
    public function drive(){
        $this->car->run();
    }
 
    public function __construct(ICar $Icar){
        $this->car = $Icar;
    }
}
 
class BMW implements ICar {
    public function run(){
        echo 'this is BWM running';
    }
}
 
class Client{
    public function __construct(){
        $san = new Driver(new BMW());
        $san->drive();
 
 
    }
}
$a = new Client();

Setter方法传递对象

interface IDriver {
    public function drive();
}
 
interface ICar {
    public function run();
}
 
class driver implements IDriver {
    protected $car;
 
    public function drive(){
        $this->car->run();
    }
 
    public function setter(ICar $ICar){
        $this->car = $ICar;
    }
}
 
class BMW implements ICar {
    public function run(){
        echo 'i have a bmw';
    }
}
 
class Client{
    public function __construct(){
 
        $san = new driver();
        $san->setter(new BMW());
        $san->drive();
    }
 
}
$a = new Client();

接口声明依赖对象

<?PHP
 
/**
 * User: didi
 * Date: 2017/8/29
 * Time: 上午7:31
 */
interface IDriver {
    public function drive(Icar $car);
}
 
interface ICar {
    public function run();
}
 
 
class Driver implements IDriver {
    public function drive(Icar $car){
        $car->run();
    }
}
 
class BMW implements ICar{
    public function run(){
        echo 'BMW RUN';
    }
}
 
 
class Client{
    public function __construct(){
        $san = new Driver();
        $bmw = new BMW();
        $san->drive($bmw);
    }
 
}
 
 
$a = new Client();