yii2 动态配置日志(log)

如果我们在项目中不允许修改配置文件中的 log 组件，那么动态配置 log 就变得很重要了，下面我分享一下动态配置 log 的方法:

默认的日志格式是 {date}{ip}{userID}{sessionID}{level}{category}{text}{trace}

这种方式不会让默认的 app.log 失效。（推荐）

public function init()
{
    parent::init();
    Yii::$app->log->targets[] = Yii::createObject([  
        'class' => 'yiilogFileTarget',
        'exportInterval' => 1,  //立即刷新日志
        'levels' => ['info', 'error'], // only display info ,error
        'categories' => ['custom'],  //log category
        'logFile' => Yii::getAlias('@app').DIRECTORY_SEPARATOR.'runtime'.DIRECTORY_SEPARATOR.'logs'.DIRECTORY_SEPARATOR.'logFileName.log', // filePath
        'logVars' => ['_GET', '_POST'],  //只记录_GET _POST的值
        'maxFileSize' => 1024 * 2,  // 日志文件大小
        'maxLogFiles' => 10,  // 日志个数
    ]);
}

这种方式，异常不能写入 app.log 。

public function init()
{
    parent::init();
    Yii::$app->log->targets[0]->levels = ['info', 'error', 'warning']; // only display info ,error and warning
    Yii::$app->log->targets[0]->categories = ['categoryName']; // log category
    Yii::$app->log->targets[0]->logFile = Yii::getAlias('@app').DIRECTORY_SEPARATOR.'runtime'.DIRECTORY_SEPARATOR.'logs'.DIRECTORY_SEPARATOR.'logFileName.log'; // filePath
    Yii::$app->log->targets[0]->logVars = ['*'];  // don't display GET,POST,SERVER,COOKIE,SESSION, if config this,display otherwise.
    Yii::$app->log->targets[0]->maxFileSize = 1024 * 2; // maxFileSize=2M
    Yii::$app->log->targets[0]->maxLogFiles = 20;  // maxLogFiles = 20
    
    ...
}

`