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,rializable,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 盘剥a(2);$a3 = new a(3)高中政治必修四;$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($a2); //splobjectstorage::contains用于检查对象是否存拓展感想在storage中var_dump($container->contains($a1)); //truevar_dump($container->contains($a4)); //fal //遍历$container->rewind();while($containesaver->valid()) {  var_dump($container->current());  $container->next();}海洋污染的危害