登录后进行操作，user->identity为null [ 2.0 版本 ]

'vendorPath' => dirname(dirname(DIR)) . '/vendor',

'timeZone' => 'Asia/Shanghai',
'components' => [
    'db' => [
        'class' => 'yii\db\Connection',
        'dsn' => 'mysql:host=localhost;dbname=kf_cem',
        'username' => 'cem',
        'password' => 'cem!@SY2018',
        'charset' => 'utf8'
    ],
    'cache' => [
        'class' => 'yii\caching\FileCache',
    ],
    'image' => [
        'class' => 'yii\image\ImageDriver',
        'driver' => 'GD',  //GD or Imagick
    ],
    'session' => [
        'timeout' => 3600,
    ],
	'log' => [
        'traceLevel' => YII_DEBUG ? 3 : 0,
        'targets' => [
            [
                'class' => 'yii\log\FileTarget',
                'levels' => ['error','warning','info'],
            ],
        ],
    ],

没什么特别的阿，backend和frontend登录是分开的

'id' => 'app-frontend',
'basePath' => dirname(__DIR__),
'bootstrap' => ['log'],
'controllerNamespace' => 'frontend\controllers',
'defaultRoute' => 'site',
'modules' => [
    'wap'=>[
        'class'=>'app\modules\wap\WapModule',
    ],
    'agent'=>[
        'class'=>'app\modules\agent\AgentModule',
    ],
    'salesClerk'=>[
        'class'=>'app\modules\salesClerk\SalesClerkModule'
    ]
],
'components' => [
    'user' => [
        'identityClass' => 'common\models\PayUser',
        'enableAutoLogin' => true,
    ],
    'log' => [
        'traceLevel' => YII_DEBUG ? 3 : 0,
        'targets' => [
            [
                'class' => 'yii\log\FileTarget',
                'levels' => ['error','warning','info'],
                'categories' => ['pay'],
                'logFile' => '@app/runtime/logs/pay.log',
            ],
        ],
    ],
    'errorHandler' => [
        'errorAction' => 'site/error',
    ],
    'urlManager' => [
        'enablePrettyUrl' => true,
        'showScriptName' => false,
        'rules' => [
        ],
    ],
    'request' => [
        'cookieValidationKey' => 'fill in a secret key here',
    ],
],