Logger

A logger is a wrapper class that uses a callback function to interact with your log. The callback function receives the prepared data and writes it to the log.

Also you can set PSR/LOG or own implementation of Psr\Log\LoggerInterface as logger handler.

Method	Description
set()	Set logger or callback function.
log()	Logs with an arbitrary level.
emergency()	System is unusable.
alert()	Action must be taken immediately.
critical()	Critical conditions.
error()	Runtime errors that do not require immediate action
warning()	Exceptional occurrences that are not errors.
notice()	Normal but significant events.
info()	Interesting events.
debug()	Detailed debug information.