PHP SplObjectStorage usage example_PHP tutorial

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:

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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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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(); }

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