Typed collection with phpdoc

wtf.php

<?php
// @see https://www.sitepoint.com/creating-strictly-typed-arrays-collections-php/

class Wtf
{
    public function wow()
    {
        echo __METHOD__;
    }
}

class WtfCollection implements Iterator
{

    public function __construct(Wtf ...$values)
    {
        $this->values = $values;
    }

    public function current(): Wtf {}

    public function next()
    {}

    public function valid()
    {}

    public function rewind()
    {}

    public function key()
    {}

}


$many = new WtfCollection(new Wtf());

foreach ($many as $one) {
    $one->wow();
}