aggregate = $aggregate;		$this->aggregateCount = $this->aggregate->getCounts();	}	 	public function first(){		$this->index = 0;	}	 	public function next(){		if($this->index < $this->aggregateCount){			$this->index = $this->index + 1;		}	}	 	public function isDone(){		if($this->index == $this->aggregateCount){			return true;		}		return false;	}	 	public function currentItem(){		return $this->aggregate->getItem($this->index);	}	 	public function getAggregateCount(){		return $this->aggregateCount;	}} /** * 聚合对象的抽象类，定义了创建相应迭代器对象的接口,每一个实现该聚合对象抽象类的对象都要实现这个抽象方法 */abstract class Aggregate{	public abstract function createIterator();} /** * 具体的聚合对象,实现创建相应迭代器对象的功能 */class ConcreteAggregate extends Aggregate{	//聚合对象的具体内容	private $arrayAgg = null;	 	/**	 * 构造函数:传入聚合对象具体的内容,在这个例子中是数组	 * @param $arrayAgg 聚合对象的具体内容	 */	 	public function __construct($arrayAgg){		$this->arrayAgg = $arrayAgg;	}	 	public function createIterator(){		//实现创建Iterator的工厂方法		return new ConcreteIterator($this);	}	 	public function getItem($index){		if($index < sizeof($this->arrayAgg)){			return $this->arrayAgg[$index];		}	}	 	public function getCounts(){		return sizeof($this->arrayAgg);	}} /** * 看看具体的使用方法 */$aggregate = new ConcreteAggregate(array('张三','李四','王五'));$iterator = $aggregate->createIterator(); $iterator->first();while(!$iterator->isDone()){	$obj = $iterator->currentItem();	echo "The obj == ".$obj."
";	$iterator->next();}?>

　　UML