头部引入log类
use yiilogFileTarget;

$time = microtime(true);
$log = new FileTarget();
$log->logFile = Yii::$app->getRuntimePath() . '/logs/zhidemy.com.log'; //文件名自定义
$log->messages[] = ['test',1,'application',$time];
$log->export();


这样基本就能写出来了，先看一下$log->message的类描述信息
/*
* [0] => message (mixed, can be a string or some complex data, such as an exception object)
* [1] => level (integer)
* [2] => category (string)
* [3] => timestamp (float, obtained by microtime(true))
* [4] => traces (array, debug backtrace, contains the application code call stacks)
*/

传递参数按照这些信息进行传递就可以了。最后记住重要的一点
$log->messages[] 别忘了加[] 
具体可查看Target类