Yii2源码分析(1)-- index.php

// comment out the following two lines when deployed to production
//当部署到生产环境时，请把下面两行关于调试的代码注释掉
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

//加载基础类
require(__DIR__ . '/../vendor/autoload.php');
require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');

//加载配置文件，创建应用实例
$config = require(__DIR__ . '/../config/web.php');
(new yii\web\Application($config))->run();