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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