Comment écrire des logs dans le framework Yii ?

'log' => [
    'traceLevel' => YII_DEBUG ? 3 : 0,
    'targets' => [
        [
            'class' => 'yii\log\FileTarget',
            'levels' => ['error', 'warning'],
            'logVars' => ['_GET'],
        ],
    ],
],

'logVars' => ['*'], // 只记录message

Yii::error($message);
Yii::warning($message);

Yii::$app->log->targets[0]->logFile = Yii::getAlias('@runtime').DIRECTORY_SEPARATOR.'logs'.DIRECTORY_SEPARATOR.'app2.log';
Yii::warning($message);

'log' => [
    'traceLevel' => YII_DEBUG ? 3 : 0,
    'targets' => [
        [
            'class' => 'yii\log\FileTarget',
            'levels' => ['error', 'warning'],
            'logVars' => ['*'],
            //'categories' => ['application'],
            //'logFile' => '@runtime/logs/app.log',
        ],
        [
            'class' => 'yii\log\FileTarget',
            'categories' => ['pay'],
            'levels' => ['error', 'warning'],
            'logVars' => ['*'],
            'logFile' => '@runtime/logs/pay.log',
        ],
        [
            'class' => 'yii\log\FileTarget',
            'categories' => ['order'],
            'levels' => ['error', 'warning'],
            'logVars' => ['*'],
            'logFile' => '@runtime/logs/order.log',
        ],
    ],
],

Yii::warning($message,'pay')