如何在PHP类方法中接收特定接口的数组？

Question

I want to receive array of MyInterface as the in the below code.

public function saveMultiple(
    \Path\To\MyInterface $attachLinks[]
);

The above code doesn't work.

So please don't tell me that just remove \\Path\\To\\MyInterface and to use a variable $attachLinks . I'm already aware of that but this is something which I require.

Answer 1

There are no generic types in php, so you can not specify type «array of something».

But you may do a trick. Check types of elements in array.

array_walk($attachLinks, function (\Path\To\MyInterface $item) {});

If you wrap it in assert, you will be able to disable this check.

assert('array_walk($attachLinks, function (\Path\To\MyInterface $item) {})');

Answer 2

So far this is what can be done using PHP7 . Till date passing arrays with specific type is not possible.

public function saveMultiple(
    array $attachLinks
);

It'll now at least make sure that the method only gets array as parameter.

Answer 3

Maybe you can use some type of setter like:

private $attachLinks = [];
public function setter(MyInterface $var)
{
    $this->attachLinks[] = $var;
}

And than use a $this->attachLinks in your function

public function saveMultiple() {
    print_r($this->attachLinks);
}