入口文件index.php

1.加载引用 

2.配置（id与路径为必备参数）

'yourName',
    'basePath'=>dirname(__DIR__),
];

//也可以类似下面的引用配置
$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/../../common/config/main.php'),
    require(__DIR__ . '/../../common/config/main-local.php'),
    require(__DIR__ . '/../config/main.php'),
    require(__DIR__ . '/../config/main-local.php')
);

3.实例化一个应用

'yourName',
    'basePath'=>dirname(__DIR__),
];

//也可以类似下面的引用配置
$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/../../common/config/main.php'),
    require(__DIR__ . '/../../common/config/main-local.php'),
    require(__DIR__ . '/../config/main.php'),
    require(__DIR__ . '/../config/main-local.php')
);

//实例化应用
(new yii\web\Application($config))->run();