Universal Data Container

gistfile1.php

<?php

class DataCollection implements \IteratorAggregate
{
    private $data;

    public function __construct($data)
    {
        $this->data = $data;
    }

    public function getIterator()
    {
        if (is_callable($this->data)) {
            return new static(
                call_user_func_array($this->data, func_get_args())
            );
        }
        if (is_array($this->data)) {
            return new \ArrayIterator($this->data);
        }
        if ($this->data instanceof \IteratorAggregate) {
            return $this->data->getIterator();
        }
        if ($this->data instanceof \Iterator) {
            return $this->data;
        }
    }
}

$array = new DataCollection([1,2,3,4,5]);
$callback = new DataCollection(function() { return [1,2,3,4,5]; });
$generator = new DataCollection(function() { for($i = 1; $i < 6; $i++) yield $i; });

print_r(iterator_to_array($array));
print_r(iterator_to_array($callback));
print_r(iterator_to_array($generator));