class myIterator implements Iterator

{

    private $var = array(1, 2, 3, 4, 5);

    public function __construct(){}

    public function rewind()

    {

        reset($this->var);

    }

    public function current()

    {

        return current($this->var);

    }

    public function key()

    {

        return key($this->var);

    }

    public function next()

    {

        return next($this->var);

    }

    public function valid()

    {

        return ($this->current() !== false);

    }

}

$it = new myIterator;

foreach($it as $key => $value) {

    echo "$key=>$value\n";

}