How to implement login diary with Yii framework

How to implement login diary with Yii framework
Administrators can view the history of the logged on system. Includes information about failures and successes.
The diary information is: Login IP, login user name, information description. Login time.
The main is how to record this information and then show it, want to use the file to record this information.

------Solution--------------------
Write a log class yourself, the record is.
------Solution--------------------
. ***.***.***; Login username 1; information description 1; Login Time 1
. ***.***.***; login username 2; information description 2; login Time 2
. ***.***.***; login username 3; information description 3; login Time 3
···
···


To Explode into a string and then each record line file_put_contents to the file

You can also put each record into a long string with a symbol
read out only the number of the style of the display of the landlord can design their own

------Solution--------------------
Inherit the Cuseridentity class, rewrite the Authenticate method, add log in the Authenticate method to log the data!
A relatively simple approach using the Error_log method
Error_log ($msg, 3, ' Login_log ');

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