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<?php

class Test implements Iterator, ArrayAccess
{
    private $position;
    private $_items = array();

    public function __construct()
    {
        $this->position = 0;
    }

    public function rewind()
    {
        $this->position = 0;
    }

    public function current()
    {
        return $this->_items[$this->position];
    }

    public function key()
    {
        return $this->position;
    }

    public function next()
    {
        ++ $this->position;
    }

    public function valid()
    {
        return isset($this->_items[$this->position]);
    }

    public function offsetSet($offset, $value)
    {
        if ($offset === null) {
            $this->_items[] = $value;
        } else {
            $this->_items[$offset] = $value;
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->_items[$offset]);
    }

    public function offsetUnset($offset)
    {
        unset($this->_items[$offset]);
    }

    public function offsetGet($offset)
    {
        return $this->offsetExists($offset) ? $this->_items[$offset] : null;
    }
}