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PHP SplObjectStorage usage example_PHP tutorial

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Release： 2016-07-13 09:53:44

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PHP SplObjectStorage usage examples

This article mainly introduces PHP SplObjectStorage usage examples. SplObjectStorage is a data structure object container in the SPL standard library, used to store a group of objects, especially When you need to uniquely identify an object, friends who need it can refer to it

PHP SPL SplObjectStorage is used to store a set of objects, especially when you need to uniquely identify the object.

PHP SPL SplObjectStorage class implements four interfaces: Countable, Iterator, Serializable, and ArrayAccess. It can realize statistics, iteration, serialization, array access and other functions.

Look at a simple example below:

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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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 adds objects to Storage $container->attach($a1); $container->attach($a2); $container->attach($a3); //SplObjectStorage::detach removes the object from Storage $container->detach($a2); //SplObjectStorage::contains is used to check whether the object exists in Storage var_dump($container->contains($a1)); //true var_dump($container->contains($a4)); //false //Traverse $container->rewind(); while($container->valid()) { var_dump($container->current()); $container->next(); }

http://www.bkjia.com/PHPjc/1000100.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1000100.htmlTechArticlePHP SplObjectStorage usage examples This article mainly introduces PHP SplObjectStorage usage examples. SplObjectStorage is a data structure in the SPL standard library. Object container, used to store a group of objects, especially...