迭代器 Iterator

 1 <?php
 2 
 3 class order{
 4     //无set get 暂不分装结构体;
 5      public $a;
 6      public $b;
 7      public $c;
 8 }
 9 
10 /**
11 * Iterator模式的简单实现类
12 */
13 class sample implements Iterator {
14     private $_items ;
15     
16     public function __construct(){
17         for($i=0;$i<3;$i++){
18             $a=new order();
19             $a->a=$i*3;
20             $a->b=$i*4;
21             $a->c=$i*5;
22             $this->_items[]=$a;
23         }
24     }
25     
26     
27  
28 //     public function __construct(&$data) {
29 //         $this->_items = $data;
30 //     }
31     public function current() {
32         return current($this->_items);
33     }
34  
35     public function next() {
36         next($this->_items);   
37     }
38  
39     public function key() {
40         return key($this->_items);
41     }
42  
43     public function rewind() {
44         reset($this->_items);
45     }
46  
47     public function valid() {                                                                              
48         return ($this->current() !== FALSE);
49     }
50 }
51  
52 /** DEMO */
53 $sa = new sample();
54 print_r($sa);
55 foreach ($sa AS $key => $row) {
56     print_r($row->a);
57 }
58 
59 ?>