Suggestions for iterators

Hello,

I am looking for a way to specify type of items in collection for PhpStorm.

For example, i have class which implements interface Iterator.
Inside this class I have an array of items

class Collection implements Iterator, Countable {

     protected $key = 0;

     /**
     * @var EntityAbstract[]
     */
     protected $array = [];

     public function current() {
     return $this->array[$this->key];
     }

     ... rest of necessary methods ...
}

Now, I want to iterate through my collection with, let's say, foreach:

$co = new Collection();

foreach ($co as $item) { 
     $item->...
}

Here I do not have suggestions for $item, because IDE knows nothing about type of items in my collection, I have specified type for property $array, but IDE does not know that $array is my storage for collection.

I know, that I can specify type of my collection items right in foreach, like this

foreach ($co as $val) {
     /** @var $val EntityAbstract */
     prr($val->...);
}

But I need to do it all of the time and it is not convenient. I wonder, maybe there is some way to specify type of collection items in one place, because it is quite logical as I think.