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Oliver Davies 2018-11-23 12:29:20 +00:00
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# Consolidation\Log
Improved [PSR-3](http://www.php-fig.org/psr/psr-3/) [Psr\Log](https://github.com/php-fig/log) logger based on Symfony Console components.
[![Travis CI](https://travis-ci.org/consolidation-org/log.svg?branch=master)](https://travis-ci.org/consolidation-org/log) [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/consolidation-org/log/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/consolidation-org/log/?branch=master) [![Coverage Status](https://coveralls.io/repos/github/consolidation-org/log/badge.svg?branch=master)](https://coveralls.io/github/consolidation-org/log?branch=master) [![License](https://poser.pugx.org/consolidation/log/license)](https://packagist.org/packages/consolidation/log)
## Component Status
In use in [Robo](https://github.com/Codegyre/Robo).
## Motivation
Consolidation\Log provides a Psr-3 compatible logger that provides styled log output to the standard error (stderr) stream. By default, styling is provided by the SymfonyStyle class from the Symfony Console component; however, alternative stylers may be provided if desired.
## Usage
```
$logger = new \Consolidation\Log\Logger($output);
$logger->setLogOutputStyler(new LogOutputStyler()); // optional
$logger->warning('The file {name} does not exist.', ['name' => $filename]);
```
String interpolation -- that is, the substitution of replacements, such as `{name}` in the example above, is not required by Psr-3, and is not implemented by default in the Psr\Log project. However, it is recommended by PRS-3, and is often done, e.g. in the Symfony Console logger.
Consolidation\Log supports string interpolation.
## Comparison to Existing Solutions
Many Symfony Console compoenents use SymfonyStyle to format their output messages. This helper class has methods named things like `success` and `warning`, making it seem like a natural choice for reporting status.
However, in practice it is much more convenient to use an actual Psr-3 logger for logging. Doing this allows a Symfony Console component to call an external library that may not need to depend on Symfony Style. Having the Psr\Log\LoggerInterface serve as the only shared IO-related interface in common between the console tool and the libraries it depends on promots loose coupling, allowing said libraries to be re-used in other contexts which may wish to log in different ways.
Symfony Console provides the ConsoleLogger to fill this need; however, ConsoleLogger does not provide any facility for styling output, leaving SymfonyStyle as the preferred logging mechanism for style-conscienscious console coders.
Consolidation\Log provides the benefits of both classes, allowing for code that both behaved technically correctly (redirecting to stderr) without sacrificing on style.
Monlog also provides a full-featured Console logger that might be applicable for some use cases.