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:
- class A {
- public $i;
- public function __construct($i) {
- $this->i = $i;
- }
- }
- $a1 = new A(1);
- $a2 = new A(2);
- $a3 = new A(3);
- $a4 = new A(4);
- $container = new SplObjectStorage();
- //SplObjectStorage::attach 添加对象到Storage中
- $container->attach($a1);
- $container->attach($a2);
- $container->attach($a3);
- //SplObjectStorage::detach 将对象从Storage中移除
- $container->detach($a2);
- //SplObjectStorage::contains用于检查对象是否存在Storage中
- var_dump($container->contains($a1)); //true
- var_dump($container->contains($a4)); //false
- //遍历
- $container->rewind();
- while($container->valid()) {
- var_dump($container->current());
- $container->next();
- }
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