Question

让我们说我有这些课程：

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"
]);

哪个工作正常。

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();

这不起作用。我遇到错误：must be compatible with

我想要什么？

我希望“句柄”功能仅在传递数组数据或不传递数组数据时起作用。。

Answer 1

如@ jacki360所述，最接近的方法是使用func_get_args()。

SELECT consecutive_id, MIN(id) as id
FROM (
    SELECT a.consecutive_id, MIN(id) AS id
    FROM test AS a
    JOIN (
        SELECT consecutive_id
        FROM test 
        GROUP BY consecutive_id 
        HAVING COUNT(DISTINCT unique_id) > 1) AS b
    ON a.consecutive_id = b.consecutive_id
    GROUP BY a.consecutive_id, a.unique_id
    HAVING COUNT(*) = 1) AS x
GROUP BY consecutive_id

Answer 2

您的函数必须具有相同的签名，因此您可以尝试的是使该函数不带参数：handle（）当您需要参数时，只需在调用方法时将其传递并使用 func_get_args

Answer 3

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

    public function setArguments(Array $arguments, $recursive = false) {
        $this->data = $recursive === true ? $this->data : array();

        // Do additional formatting here if needed
        foreach ($arguments as $key => $argument) {
            if (is_array($argument)) {
                $this->setArguments($argument, true);
            } else {
                $this->data[$key] = $argument;
            }
        }

        $this->setColor();
    }

    public function setColor() {
        $this->color = !empty($this->data['color']) ? $this->data['color'] : 'Any';
    }
}

class CarA extends Car {
    public function handle() {
        $this->setArguments(func_get_args());
        echo 'Color: ' . $this->color;
    }
}

class CarB extends Car {
    public function handle() {
        $this->setArguments(func_get_args());
        echo 'Color: ' . $this->color;
    }
};

$carA = new CarA();
$carA->handle(array(
    'color' => 'Color1'
));

$carB = new CarB();
$carB->handle();
$carB->handle(array(
    'color' => 'Color2'
));

将参数作为抽象函数中的可选参数

问题：

3 个答案: