---
title: Log
url: 'https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/psr/log'
markdown: 'https://brendo.org/wp-content/plugins/two-factor-provider-webauthn/vendor/psr/log.md'
date: '2026-04-06'
description: 'PSR Log This repository holds all interfaces/classes/traits related to PSR-3. Note that this is not a logger of its own. It is merely an interface that describes a logger. See the specification for more details. Installation composer require psr/log Usage If you need a logger, you can use the inter…'
---

# PSR Log

This repository holds all interfaces/classes/traits related to [PSR-3](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md).

Note that this is not a logger of its own. It is merely an interface that describes a logger. See the specification for more details.

## Installation

```bash
composer require psr/log
```

## Usage

If you need a logger, you can use the interface like this:

```php
<?php

use Psr\Log\LoggerInterface;

class Foo
{
    private $logger;

    public function __construct(LoggerInterface $logger = null)
    {
        $this->logger = $logger;
    }

    public function doSomething()
    {
        if ($this->logger) {
            $this->logger->info('Doing work');
        }

        try {
            $this->doSomethingElse();
        } catch (Exception $exception) {
            $this->logger->error('Oh no!', array('exception' => $exception));
        }

        // do something useful
    }
}
```

You can then pick one of the implementations of the interface to get a logger.

If you want to implement the interface, you can require this package and implement `Psr\Log\LoggerInterface` in your code. Please read the [specification text](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md)for details.

---

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