键入数组的提示内容

Question

I've got a method that accepts an array of rules as an argument.

public function setRule($name, Array $rules) { ... }

The passed in array should only contain objects that implement the IRule interface, but since I can't type hint the content of an array I would like to know if there's maybe another way of doing it?

I would highly appreciate examples with your answers.

Answer 1

It is not possible in the function header, but you can do instanceof checks later on.

Example:

foreach ($rules as $r) {
  if ($r instanceof IRule) {
    do_something();
  } else {
    raise_error();
  }
}