php - 在抽象函数中将参数设为可选

Question

假设我有这些类(class):

abstract class Car
{
    abstract public function handle(array $data);
}

class CarA extends Car 
{
    public function handle(array $data)
    {
        echo $data['color'];
    }
}

$car= new CarA();
// Here I can pass args as an array
$car->handle([
    "color" => "white"
]);

效果很好。

问题:

现在我不想传递任何参数

class CarB extends Car 
{
    public function handle()
    {
        echo 'CarB';
    }
}

$car= new CarB();
// Here I dont wnat to pass any args, I just want to call the method.
$car->handle();

这是行不通的。我遇到错误:必须兼容

我想要什么？

我希望“句柄”函数仅在传递数组数据或未传递数组数据时起作用。

Answer 1

如@jacki360 所述，最接近的是使用 func_get_args() .

abstract class Car
{
    abstract public function handle();
}

class CarA extends Car 
{
    public function handle()
    {
        $args = func_get_args();
        if ( count($args) && is_array($args[0]) ) {
            $data = $args[0];
            echo $data['color'];
        }
    }
}
class CarB extends Car
{
    public function handle()
    {
        echo self::Class . "\n";
    }
}

$car= new CarA();
// Here I can pass args as an array
$car->handle([
    "color" => "white"
]);
$car2 = new CarB;
$car2->handle();