PHP array of non-primitive class as function parameter

Question

I am wondering (if possible) how you would declare an array of non-primitive class as a function parameter. For example

Answer 1

Main fact - currently you can't type hint argument as array of something.

So you options are:

// just a function with some argument, 
// you have to check whether it is array 
// and whether each item in this array has type `C`
function f($c) {} 

// function, which argument MUST be array.
// if it is not array - error happens
// you still have to check whether 
// each item in this array has type `C`
function f(array $c) {} 

// function, which argument of type CCollection
// So you have to define some class CCollection
// object of this class can store only `C` objects
function f(CCollection $c) {} 

// class CCollection can be something like
class CCollection 
{
    private $storage = [];

    function addItem(C $item)
    {
        $this->storage[] = $item;
    }

    function getItems()
    {
        return $this->storage;
    }
}