Sends your logs to files, sockets, inboxes, databases and various web services
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Monolog - Logging for PHP Continuous Integration

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Note This is the documentation for Monolog 3.x, if you are using older releases see the documentation for Monolog 2.x or Monolog 1.x

Monolog sends your logs to files, sockets, inboxes, databases and various web services. See the complete list of handlers below. Special handlers allow you to build advanced logging strategies.

This library implements the PSR-3 interface that you can type-hint against in your own libraries to keep a maximum of interoperability. You can also use it in your applications to make sure you can always use another compatible logger at a later time. As of 1.11.0 Monolog public APIs will also accept PSR-3 log levels. Internally Monolog still uses its own level scheme since it predates PSR-3.


Install the latest version with

$ composer require monolog/monolog

Basic Usage


use Monolog\Level;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;

// create a log channel
$log = new Logger('name');
$log->pushHandler(new StreamHandler('path/to/your.log', Level::Warning));

// add records to the log


Support Monolog Financially

Get supported Monolog and help fund the project with the Tidelift Subscription or via GitHub sponsorship.

Tidelift delivers commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use.

Third Party Packages

Third party handlers, formatters and processors are listed in the wiki. You can also add your own there if you publish one.



  • Monolog ^3.0 works with PHP 8.1 or above.
  • Monolog ^2.5 works with PHP 7.2 or above.
  • Monolog ^1.25 works with PHP 5.3 up to 8.1, but is not very maintained anymore and will not receive PHP support fixes anymore.


Monolog 1.x support is somewhat limited at this point and only important fixes will be done. You should migrate to Monolog 2 or 3 where possible to benefit from all the latest features and fixes.

Submitting bugs and feature requests

Bugs and feature request are tracked on GitHub

Framework Integrations


Jordi Boggiano - [email protected] -
See also the list of contributors who participated in this project.


Monolog is licensed under the MIT License - see the LICENSE file for details


This library is heavily inspired by Python's Logbook library, although most concepts have been adjusted to fit to the PHP world.

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