SPL标准库专题10DatastructuresSplObjectStorage

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)); //true
var_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…