PHP-迭代器

<?php
$stu=['tom','berry','ketty','rose'];
reset($stu);	//复位指针
while(key($stu)!==null){//键合法
	echo key($stu),'-',current($stu),'<br>';//获取键、值
	next($stu);		//指针下移
}
/*
0-tom
1-berry
2-ketty
3-rose
*/

<?php
//定义类实现迭代器接口
class MyClass implements Iterator{
	//$list属性用来保存学生数组
	private $list=array();
	//添加学生
	public function addStu($name) {
		$this->list[]=$name;
	}
	//实现接口中的复位方法
	public function rewind() {
		reset($this->list);
	}
	//验证当前指针是否合法
	public function valid() {
		return key($this->list)!==null;
	}
	//获取值
	public function current() {
		return current($this->list);
	}
	//获取键
	public function key() {
		return key($this->list);
	}
	//指针下移
	public function next() {
		next($this->list);
	}
}

//创建班级
$class=new MyClass();
//添加学生
$class->addStu('tom');
$class->addStu('berry');
$class->addStu('ketty');
//遍历班级
foreach($class as $k=>$v){
	echo "{$k}-{$v}<br>";
}
/*
0-tom
1-berry
2-ketty
*/