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PHP SplObjectStorage使用实例

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Release: 2016-06-13 09:04:23
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PHP SplObjectStorage使用实例

   这篇文章主要介绍了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:

  ?

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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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