迭代器 Iterator

最简单的迭代器：

<?php

class order{
    //无set get 暂不分装结构体;
     public $a;
     public $b;
     public $c;
}

/**
* Iterator模式的简单实现类
*/
class sample implements Iterator {
    private $_items ;
    
    public function __construct(){
        for($i=0;$i<3;$i++){
            $a=new order();
            $a->a=$i*3;
            $a->b=$i*4;
            $a->c=$i*5;
            $this->_items[]=$a;
        }
    }
    
    
 
//     public function __construct(&$data) {
//         $this->_items = $data;
//     }
    public function current() {
        return current($this->_items);
    }
 
    public function next() {
        next($this->_items);   
    }
 
    public function key() {
        return key($this->_items);
    }
 
    public function rewind() {
        reset($this->_items);
    }
 
    public function valid() {                                                                              
        return ($this->current() !== FALSE);
    }
}
 
/** DEMO */
$sa = new sample();
print_r($sa);
foreach ($sa AS $key => $row) {
    print_r($row->a);
}

?>