php 以数组形式访问对象
官方文档上:
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 ) }
实现上面的方法,下面举个实例
<?php /** * Created by PhpStorm. * User: wangHan * Date: 2016/10/21 * Time: 14:07 */ class Human implements ArrayAccess { private $elements; public function __construct() { $this->elements = [ "boy" => "male", "girl" => "female" ]; } public function offsetExists($offset) { // TODO: Implement offsetExists() method. return isset($this->elements[$offset]); } public function offsetGet($offset) { // TODO: Implement offsetGet() method. return $this->elements[$offset]; } public function offsetSet($offset, $value) { // TODO: Implement offsetSet() method. $this->elements[$offset] = $value; } public function offsetUnset($offset) { // TODO: Implement offsetUnset() method. unset($this->elements[$offset]); } } $human = new Human(); $human['people'] = "boyAndGirl"; ////自动调用offsetSet if(isset($human['people'])) { ////自动调用offsetExists echo $human['boy'];//自动调用offsetGet echo '<br />'; unset($human['boy']);//自动调用offsetUnset var_dump($human['boy']); } // // 输出结果 male null