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PHP 实现 IOC set 注入

Jun 23, 2016 pm 01:34 PM

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;    }}
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其中 DocParser.php 为解析php注释的工具类。

  • 使用方法篇
    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();    }}
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    新建Email.php

    class Email {    public function sendEmail() {        echo 'send email!';    }}
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    在根目录下新建index.php

    require 'Container.php';$di = new Container();$user = $di->get('User');$user->sendEmail();
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    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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