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。
类摘要
SplObjectStorage implements Countable , Iterator , Serializable , ArrayAccess { /* 方法 */ public void addAll ( SplObjectStorage $storage ) // ↓↓加入对象 public void attach ( object $object [, mixed $data = NULL ] ) // ↓↓检查是否包含指定对象 public bool contains ( object $object ) // ↓↓移除对象 public void detach ( object $object ) // ↓↓返回一串哈希值，每次调用的时候该串哈希值都在改变 public string getHash ( object $object ) public mixed getInfo ( void ) public int count ( void ) public object current ( void ) public int key ( void ) public void next ( void ) public bool offsetExists ( object $object ) public mixed offsetGet ( object $object ) public void offsetSet ( object $object [, mixed $data = NULL ] ) public void offsetUnset ( object $object ) public void removeAll ( SplObjectStorage $storage ) public void removeAllExcept ( SplObjectStorage $storage ) public void rewind ( void ) public string serialize ( void ) public void setInfo ( mixed $data ) public void unserialize ( string $serialized ) public bool valid ( void )}Example
# Example1：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)); //truevar_dump($container->contains($a4)); //false//遍历$container->rewind();while($container->valid()) { var_dump($container->current()); var_dump($container->getInfo()); $container->next();}参考
http://php.net/manual/zh/clas...