Yii2实现log输出到file及database的方法

'bootstrap' => [
  'log'
],

'ponents' => [
  'log' => [
    'targets' => [
      [
        'class' => 'yii\log\FileTarget',
        'exportInterval' => 1,
      ],
    ],
  ],
]

'log' => [
  'targets' => [
    [
      'class' => 'yii\log\DbTarget',
      'levels' => ['error', 'warning', 'trace'],
    ]
  ]
],

./yii migrate --migrationPath=@yii/log/migrations/

'ponents' => [
  'log' => [
    'traceLevel' => YII_ENV == 'dev' ? 3 : 0,
    'targets' => [
      [
        'class' => 'yii\log\DbTarget',
        'levels' => YII_DEBUG ? ['error', 'warning', 'trace'] : ['error'],
      ],
      [
        'class' => 'yii\log\FileTarget',
        'levels' => YII_DEBUG ? ['error', 'warning', 'trace'] : ['error', 'warning'],
      ],
    ],
  ],
],