PHP 实现 IOC set 注入
本文采用类似java中annotation的形式实现set注入
首先DI容器代码
require 'DocParser.php';class Container { /** * 利用容器来实例化对象,外部调用接口 *@param $name 为类名 eg. 'User' */ public function get($name) { static $cache = array(); if(isset($cache[$name])) { return $cache[$name]; } require 'models/' . ucfirst($name) . '.php'; $reflection = new ReflectionClass($name); $depends = $this->getDependency($reflection); $cache[$name] = $this->createObject($reflection, $depends); return $cache[$name]; } /** * 利用反射获取类需要的依赖条件,注释中包含@inject 注解的public 变量 * @param $reflection ReflectionClass */ public function getDependency($reflection) { $depends = array(); $props = $reflection->getProperties(ReflectionProperty::IS_PUBLIC); foreach ($props as $prop) { $str = $prop->getDocComment(); $parser = new DocParser(); $anotations = $parser->parse($str); if(isset($anotations['inject'])) { $depends[$prop->getName()] = $anotations['inject']; } } return $depends; } /** * 实例化对象的方法 * @param $instance ReflectionClass * @param $depends array( 'field' => 'Class' ), field 为注入的变量名,class为注入的类 */ public function createObject($instance, $depends) { $instance = $instance->newInstanceArgs(array()); foreach ($depends as $key => $value) { $instance->{$key} = $this->get($value); } return $instance; }}
其中 DocParser.php 为解析php注释的工具类。
在同级目录下新建models文件夹,新建User.php
class User { /** * 使用inject注解来标明该变量需要注入,后面跟着需要注入的类名 * @inject Email */ public $email; public function sendEmail() { $this->email->sendEmail(); }}
新建Email.php
class Email { public function sendEmail() { echo 'send email!'; }}
在根目录下新建index.php
require 'Container.php';$di = new Container();$user = $di->get('User');$user->sendEmail();
运行一下index.php就能看到结果了。
本文只是演示IOC的实现过程,没有考虑实际使用场景。
源码 下载地址

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