<转>PHP SPL标准库之数据结构对象容器(SplObjectStorage)

PHP SPL SplObjectStorage是用来存储一组对象的，特别是当你需要唯一标识对象的时候。

PHP SPL SplObjectStorage类实现了Countable,Iterator,Serializable,ArrayAccess四个接口。可实现统计、迭代、序列化、数组式访问等功能。

看下面一个简单的例子：

 

1. class A {
2. public $i;
3. public function __construct($i) {
4. $this->i = $i;
5. }
6. }
7.  
8. $a1 = new A(1);
9. $a2 = new A(2);
10. $a3 = new A(3);
11. $a4 = new A(4);
12.  
13. $container = new SplObjectStorage();
14.  
15. //SplObjectStorage::attach 添加对象到Storage中
16. $container->attach($a1);
17. $container->attach($a2);
18. $container->attach($a3);
19.  
20. //SplObjectStorage::detach 将对象从Storage中移除
21. $container->detach($a2);
22.  
23. //SplObjectStorage::contains用于检查对象是否存在Storage中
24. var_dump($container->contains($a1)); //true
25. var_dump($container->contains($a4)); //false
26.  
27. //遍历
28. $container->rewind();
29. while($container->valid()) {
30. var_dump($container->current());
31. $container->next();
32. }

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