php迭代器的基本例子

這是我自己寫的簡單的迭代器的使用，對對向的遍歷

<?php

/**
*對象的遍歷，
*需要實現系統預定的接口iterator
*iterator(迭代器)
**/
class Arr implements iterator{
private $pri=array('name'=>'zhangsan','age'=>'20','sex'=>'male');
function current(){
  return current($this->pri);
} 
function key(){
return key($this->pri);
}
function rewind(){
reset($this->pri);
}
function next(){
return next($this->pri);
}
function valid(){
return !is_null(key($this->pri));
}
}
$obj =new Arr();
echo "<pre>";
foreach($obj as $k=>$v){
echo $k."=>".$v,"<br/>";

}

示例：