Use of Monolog with PHP

Monolog in PHP
Presenter : SATHEESKUMAR A
Company : MINDFIRE SOLUTIONS
Date : 04/06/2014

Presenter: Satheeskumar A, Mindfire Solutions
About me
➢ Zend Certified Engineer (ZCE)
➢ Oracle Certified Mysql Professional (OCP – MYSQL)
➢ 10 gen certified Mongodb professional
➢ Microsoft Certified HTML5 professional
➢ Accrediated certified Scrum Master
Skills: PHP, Mysql, Symfony2, CodeIgniter, SVN, GIT,
Doctrine, Propel ...
Connect me:
Facebook: https://www.facebook.com/satheeskumar.ashokkumar/
Twitter: https://twitter.com/sathees1kumar
Linked in: in.linkedin.com/in/satheeskumara/
Google Plus: https://plus.google.com/+satheeskumara
Contact me:
E-mail: satheeskumara@mindfiresolutions.com / Sathees1kumar@gmail.com
Skype: mfsi_satheesk

Agenda

What is Logging

History of logging

Need of Logging

Current Conventions

Use of Monolog

Components of Monolog

Different Types of Handlers

Types of Formatters

Tips and Tricks

Sample Code

Take Away
“To know the best method of logging data of different
contexts for specific environments such as test/dev
and production”

Logging

The process of using a computer to collect data through
sensors/listeners/events.

Analyze the data and save and output the results of the
collection and analysis.

Data logging also implies the control of how the computer
collects and analyzes the data.

History of Logging

Even with use of computers there was a real need to measure the
overall performance of any reasearch

Early 1980's there was a Instrument called VELA (virtual laboratory)
used for data harvesting

Late 1980's, A device was invented to collect information through
sensors

Later then data logging/harvesting has been used widely in all
applications/reasearches/products.

Need of Logging

Track Users activity/Movement

Transaction Logging

Track user errors

System level failures/warnings

Research Data collection and Interpretation

Types of Logging

Error / Exception logs

Access logs

System logs

Application logs

Database logs

Transaction logs

Mailer logs
etc...

Current Conventions - Apache/PHP
<VirtualHost *:80>
<Directory /var/www/html/>
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Order allow,deny
allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Monolog Enters Here...

Monolog is a PHP library that support different levels of
logging for PHP Applications and depends on PSR.

Inspired by Python Logbook library

Provides stack of handlers

More Powerful than conventional way of logging in
applications

What's different ?
●
Monolog sends your logs to files, sockets, inboxes, databases
and various web services.
●
Channel based approach
●
Different stack of handlers for specific channels
●
Pile up handler stack based on severity.
●
Format Interpretation depending on severity and channel
●
Prevents Bubbling when severity is reached

Severity Levels
●
DEBUG – 100
●
INFO – 200
●
NOTICE – 250
●
WARNING – 300
●
ERROR – 400
●
CRITICAL – 500
●
ALERT – 500
●
EMERGENCY – 600

Components that make up
●
Handlers
●
Formatters
●
Processors
●
Dependent packages like send_mail / FirePHP/
Chrome PHP etc..

Handlers
●
Each logger instance will have a stack of handlers.
●
If no handlers are pushed to the stack, stream handler will handled as the
default.
●
The last pushed handler will be treated first.
●
Other handlers are bubbled up based on severity
●
Bubbling can be stopped at any level. Handler instances can be shared
between multiple channels.
●
Support to write to Database and cloud services

Formatters
●
Each handler has a default format.
●
Custom Formatter instance can be assigned to any
Handler.
●
Formatters can be shared between different handlers
●
Formatters can be different for different channels
●
Line Formatter is the default formatter.

Processors
●
Processors to include more details before the handler
renders the log message.
●
Can be used to nail down the issue
●
Used to measure the memory usage
●
Introspection of running processess.

Advantages
●
Option to have different channel for different module
●
Custom detailing
●
Different handlers for different development
●
Thorough participation in different stages of lifecycle
●
Open for third party integration
●
Readable and Beautiful Layered message

Monolog in Development Env
●
Use of FirePHPHandler and ChromePHPHandler
●
FirePHPFormatting can be used to format the log messages
●
Prevention of bubbling from writing to database

Monolog in Production Env
●
Rotatelog handler rotates log
●
Send Beautiful error messages via HTML mails
●
Write the log messages to any Database mysql, mongo, couch.
●
Support with ORM packages like Doctrine etc..
●
Can be integrated to cloud services like Loggly
●
Keeps your log messages distinct for different modular
functionality

Lets dirty our hands with code
$log = new Logger('app');
$log->pushHandler( new StreamHandler(__DIR__
. '/logs/error.log', Logger::NOTICE, false));
$log->addNotice('this is a notice');
$log->addNotice('this is an error');

Sample Code in GIT
https://github.com/sathees1kumar/monolog
Feel free to fork and play :)

Do you use Frameworks / CMS ?
●
CakePHP - https://github.com/jadb/cakephp-monolog
●
Symfony2 - https://github.com/symfony/MonologBundle
●
Slim – https://github.com/flynsarmy/Slim-Monolog
●
Zend2 - https://packagist.org/packages/enlitepro/enlite-monolog
●
CodeIgniter - https://github.com/pfote/Codeigniter-Monolog
●
Laravel – Inbuilt Support.
●
Drupal - https://drupal.org/project/monolog
●
Wordpress -
https://packagist.org/packages/fancyguy/wordpress-monolog

References
The only link which is more than enough to get started with,
https://github.com/Seldaek/monolog

?

Thank you :)

www.mindfiresolutions.com
https://www.facebook.com/MindfireSolutions
http://www.linkedin.com/company/mindfire-solutions
http://twitter.com/mindfires

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