yii框架－依赖注入

依赖注入

<?php
class MovieLister {

public function moviewsDirectedBy($directorName){

$finder = new MovieFinder();     //两个类有了强耦合关系
$allMovies = $finder->findAll();
$resultMovies = [];
foreach ($allMovies as $movie){
if($movie->getDirector() == $directorName){
$resultMoviews[] = $movie;
}
}
}
}

//程序＝算法＋数据结构   数据结构跟算法要剥离

优化：
public function moviewsDirectedBy($directorName,$finder){
$finder = $finder->findAll();
....
....
}

use yii\di\container

Class ManDriver  implements Driver{

public function drive(){
echo 'i am a driver';
}
}

interface Driver{                        //用接口去除强关联
public function driver();
}

class Car {
private $driver = null;

public function _construst(Driver $driver){
$this->driver = $driver;
}

public function run(){
$this->driver->drive();
}
}

//配置文件事先配置好，统一处理依赖关系
$container = new Container;
$car = $container->set('app\models\Driver',"app\models\ManDriver");
//$driver = new ManDriver;
//$car = Car($driver);

$car = $container->get('app\models\Car');
$car->run();

use yii\di\ServiceLocation

\Yii::$container->set('app\models\Driver',"app\models\ManDriver");
$s1 = new ServiceLocator;
$s1->set('car'[
'class' => 'app\models\Car',

]);
$car = $s1->get('car')

//可放在配置文件里统一配置，应用主体实际上就是一个服务定位器
compents => [
'car' => [
'class' => '\app\models\Car'
]

]

\Yii::$container->set('app\models\Driver',"app\models\ManDriver");
\Yii::$app->car-run();   //加载时会在动解决依赖关系