Yii2 前台用户与后台用户分离

1、将common/models/User.php在当前目录下copy一份，命名为Admin.php，修改类的名称为Admin

2、将common/models/LoginForm.php复制到backend/models/LoginForm.php

修改backend/models/LoginForm.php

namespace backend\models;

use common\models\Admin;......

protected function getUser()
  {
      if ($this->_user === null) {
          $this->_user = Admin::findByUsername($this->username);
      }

return $this->_user;
  }

3、将common/models/LoginForm.php复制到frontend/models/LoginForm.php

修改frontend/models/LoginForm.php

namespace frontend\models;

use common\models\User;

4、删除common/models/LoginForm.php

5、修改backend/config/main.php

'components' => [
        'user' => [
            'identityClass' => 'common\models\Admin',
            'enableAutoLogin' => true,
        ],
        ...
]        

6、修改frontend/config/main.php

'components' => [
        'user' => [
            'identityClass' => 'common\models\User',
            'enableAutoLogin' => true,
        ],
        ...
]

7、修改控制器backend/controllers/SiteController.php

namespace backend\controllers;

use Yii;
use yii\web\Controller;
use yii\filters\VerbFilter;
use yii\filters\AccessControl;
use backend\models\LoginForm;