foreach 参数强制类型转换的问题

时间：2010-12-10 来源：真爱无悔

所以，为了防止这样的信息出现，我使用foreach的时候，都会把参数进行强制类型转换，形势如下：

foreach((array)$arr as $key => $value);

这样做一直相安无事，就在前几天，突然出现了问题。我强制类型转换以后不能正常的调用object的方法了。

 1 <?php
 2 
 3  class service implements Iterator{
 4     function __construct($service_define,$filter=null){
 5         $this->iterator = new ArrayIterator($service_define['list']);
 6         $this->filter = $filter;
 7         $this->valid();
 8     }
 9 
10     function current(){
11         return $this->current_object;
12     }
13     
14     public function rewind() {
15         $this->iterator->rewind();
16     }
17 
18     public function key() {
19         return $this->iterator->current();
20     }
21 
22     public function next() {
23         return $this->iterator->next();
24     }
25 
26     public function valid() {
27         while($this->iterator->valid()){
28             if($this->filter()){
29                 return true;
30             }else{
31                 $this->iterator->next();
32             }
33         };
34         return false;
35     }
36     
37     private function filter(){
38         $current = $this->iterator->current();
39         if($current){
40             $this->current_object = new Sameple($current);
41             if($this->current_object){
42                 return true;
43             }
44         }
45         return false;
46     }
47 
48 }
49 
50  class Sameple{
51     var $class_name;
52     function __construct($class_name = null) {
53         $this->class_name = $class_name;
54     }
55     
56     function show(){
57         echo $this->class_name,'<br />';
58     }
59 }
60 
61 $servicelist = array(
62     'list' => array(
63         'first',
64         'second',
65         'third',
66         'fourth',
67     ),
68 );
69 $ser = new service($servicelist);
70 foreach ($ser as $s) {
71     $s->show();
72 }
73 /*
74 //执行报错的代码  使用了将$ser执行强制类型转换操作
75 foreach ((array)$ser as $s) {
76     $s->show();
77 }*/