Small definition

Wikipedia can help you!

For me :

List of events link to a time (with some messages) and recorded somewhere (usually in a file)

• Generated by
  • applications
  • infrastructures
  • some external tools : stats, CI, ...
• Purpose & Usage
  • keep track of events
  • debug
  • security
  • ...
  • linked to your business

What's in Monolog?

• Handler
  • to transport
• Formatter
  • to transform
• Processor
  • to make log spicy
• Record
  • event logged

Handler

• Transport the information to destination
• Following the level of log: debug -> emergency
• Some to know
  • StreamHandler
    • log in a file
    • use other stream too
  • NativeMailHandler : log in a mail
  • FingersCrossedHandler : stack until level
  • Tools :
    • RollBarHandler, NewRelicHandler,  ...
    • HipChatHandler, SlackHandler, ...
    • FirePHPHandler, ChromeHandler, ...

Formatter

• Link to the handler
• Transform the log event to something understandable by the handler

Processor

• Link to the handler or the logger itself
• Add informations to the event
  • Memory usage
  • Request information
  • Environment details
• Some to know
  • PsrLogMessageProcessor
  • WebProcessor
  • ...

Monolog