PHP 实现 IOC set 注入

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;    }}

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();    }}

class Email {    public function sendEmail() {        echo 'send email!';    }}

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