更改yii框架入口文件位置，修改前后端访问路径

将frontend/web/index.php复制到项目根目录，修改为：

<?php
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/vendor/autoload.php');
require(__DIR__ . '/vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/common/config/bootstrap.php');
require(__DIR__ . '/frontend/config/bootstrap.php');

$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/common/config/main.php'),
    require(__DIR__ . '/common/config/main-local.php'),
    require(__DIR__ . '/frontend/config/main.php'),
    require(__DIR__ . '/frontend/config/main-local.php')
);

(new yii\web\Application($config))->run();

　　同时在frontend/config/main.php中assetManager中添加如下代码：

'assetManager' => [
    'basePath' => '@webroot/frontend/web/assets',
    'baseUrl' => '@web/frontend/web/assets'
],

同样将backend/web/index.php复制到项目根目录，命名为admin.php(名称可随意，为了安全建议设置复杂点)，修改为：

<?php
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/vendor/autoload.php');
require(__DIR__ . '/vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/common/config/bootstrap.php');
require(__DIR__ . '/backend/config/bootstrap.php');

$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/common/config/main.php'),
    require(__DIR__ . '/common/config/main-local.php'),
    require(__DIR__ . '/backend/config/main.php'),
    require(__DIR__ . '/backend/config/main-local.php')
);

(new yii\web\Application($config))->run();

同时在backend/config/main.php中assetManager中添加如下代码：

'assetManager' => [
    'basePath' => '@webroot/backend/web/assets',
    'baseUrl' => '@web/backend/web/assets'
],

设置之后就可以访问了，比如配置了虚拟主机yii.com，那么前台访问路径为：yii.com，后台访问路径为：yii2.com/admin.php