依赖注入，避免在类中实例化对象，使此类高度依赖实例化的类.

<?php 

依赖注入两种方式，一种普通方法传参。一种构造方法传

include 'mdole.php';

class Coler

{

public $getmdoleobj = '';

public function __construct(Mdole $mdole)

{

$this->getmdoleobj = $mdole;

var_dump($this->getmdoleobj);

}

public function add()

{

include "viiw.php";

}

public function add_do()

{

$name = $_POST['username'];

$password = $_POST['password'];

$this->getmdoleobj->aaa($name,$password);

}

}

$Colerobj = new Coler($mdole);

$r = isset($_GET['r'])?$_GET['r']:'index';

$Colerobj->$r();

 ?>