PHP SplObjectStorage使用实例
SplObjectStorage是SPL标准库中的数据结构对象容器,用来存储一组对象,特别是当你需要唯一标识对象的时候,需要的朋友可以参考下:
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：
1 <?php 2 class A { 3 public $i; 4 public function __construct($i) { 5 $this->i = $i; 6 } 7 } 8 9 $a1 = new A(1); 10 $a2 = new A(2); 11 $a3 = new A(3); 12 $a4 = new A(4); 13 14 $container = new SplObjectStorage(); 15 16 //SplObjectStorage::attach 添加对象到Storage中 17 $container->attach($a1); 18 $container->attach($a2); 19 $container->attach($a3); 20 21 //SplObjectStorage::detach 将对象从Storage中移除 22 $container->detach($a2); 23 24 //SplObjectStorage::contains用于检查对象是否存在Storage中 25 var_dump($container->contains($a1)); //true 26 var_dump($container->contains($a4)); //false 27 28 //遍历 29 $container->rewind(); 30 while($container->valid()) { 31 var_dump($container->current()); 32 $container->next(); 33 }
