Iterator Design Pattern

Iterator.php

<?php
class IntegerRange implements Iterator{
	private $start;
	private $end;
	private $current;
	public function __construct($start, $end){
			$this->start  = $start;
			$this->end = $end;
			$this->current = $start;
	}
	public function rewind(){
		$this->current = $this->start;
	}
	public function current(){
		return $this->current;
	}
	public function key(){
		return $this->current;
	}
	public function next()
	{
		++$this->current;
		if($this->valid()){
			return false;
		}
		return $this->current;
	}
	public function valid()
	{
		if($this->current > $this->end){
			return false;
		}
		return true;
	}
}
$range = new IntegerRange(1, 10);
foreach($range as $value){
	echo "$value ";
}
?>