splObjectStroge的作用，实例化一个数组

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

转载请注明地址: http://www.phpddt.com/php/SplObjectStorage.html 尊重他人劳动成果就是尊重自己!