<?php/*    无Di容器的写法            class example {        private $_db;        function getList(){            $this->_db->query("......");//这里具体sql语句就省略不写了        }        //从外部注入db连接        function setDb($connection){            $this->_db = $connection;        }    }    //调用    $example = new example();    $example->setDb(Factory::getDb());//注入db连接    $example->getList();            class Factory {        public static function getExample(){            $example = new example();            $example->setDb(Factory::getDb());//注入db连接            $example->setFile(Factory::getFile());//注入文件处理类            $example->setImage(Factory::getImage());//注入Image处理类            return $expample;        }    }    实例化example时变为    $example=Factory::getExample();    $example->getList();*/header("Content-Type:text/html;charset=utf-8");class Di{    private $_factory;    public function set($id,$value){        $this->_factory[$id] = $value;    }        public function get($id){        $value = $this->_factory[$id];        return $value();    }}class User{    private $_username;    function __construct($username="") {        $this->_username = $username;    }    function getUserName(){        return $this->_username;//$this->_username = $username;    }}$di = new Di();$di->set("zhangsan",function(){    return new User(‘张三‘);}); //$this->_factory[‘zhangsan‘] = new User(‘张三‘);$di->set("lisi",function(){   return new User("李四"); }); //$this->_factory[‘lisi‘] = new User(‘李四‘);echo $di->get("zhangsan")->getUserName();// $value = http://www.mamicode.com/$this->_factory[‘zhangsan‘] = new User(‘张三‘)->getUserName();echo $di->get("lisi")->getUserName();// $value = http://www.mamicode.com/$this->_factory[‘lisi‘] = new User(‘李四‘)->getUserName();/* $data = http://www.mamicode.com/new User(‘张三‘);>*/