PHP SplObjectStorage使用实例

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();

									}

PHP SplObjectStorage使用实例

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