Explain how to use ArrayAccess, the predefined interface of PHP

After PHP5, a series of predefined interfaces were added. These interfaces and implemented classes are collectively called SPL. Among these interfaces is a heavyweight interface, ArrayAccess, which allows your objects to be accessed like an array.

Introduction to the interface, four methods need to be defined to use the ArrayAccess method.

ArrayAccess { /* Methods */ abstract public boolean offsetExists ( mixed $offset ) abstract public mixed offsetGet ( mixed $offset ) abstract public void offsetSet ( mixed $offset , mixed $value ) abstract public void offsetUnset ( mixed $offset ) }

The specific implementation of this interface in Slim is given below. Slim defines a collection class Collection, which provides general interface methods for collection objects. The CollectionInterface interface inherited by this class inherits the ArrayAccess predefined interface.

/** * 集合接口，在容器的设置中传入一个数组，返回一个Collection对象。 * Collection InterfaceCollectionInterface * @package Slim * @since 3.0.0 */ interface CollectionInterface extends \ArrayAccess, \Countable, \IteratorAggregate{ public function set($key, $value); public function get($key, $default = null); public function replace(array $items); public function all(); public function has($key); public function remove($key); public function clear(); } 说一下，Slim框架的Collection类。在Slim的容器Contianer中合并容器的默认配置$defaultSetting(类的私有变量)和用户配置$userSetting(日志，模板，数据库配置等)之后，会返回了一个集合对象Collection。由于该集合对象继承了ArrayAccess，我们在将配置文件依次加载后，就可以像操作数组一样操作它啦。

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