What is the relationship between Composer and the PSR standard?

Composer is a PHP dependency management tool that supports PSR standards, including: PSR-0 and PSR-4 automatic loading, used to load third-party libraries and self-built classes. PSR-1 and PSR-2 coding styles are used to improve code consistency and readability. PSR-3 logging for easy integration of different logging libraries.

Relationship between Composer and PSR standards

Composer is a dependency management tool for PHP that allows you to easily Introduce and manage third-party libraries. The PSR (PHP Standard Recommendations) standard is a set of PHP code writing guidelines designed to improve code readability, maintainability, and interoperability.

How does Composer support the PSR standard?

Composer provides support for the PSR standard, which is mainly reflected in the following aspects:

• PSR-0 and PSR-4 automatic loading: Composer uses the PSR-0 and PSR-4 autoloading standards to parse and load code files. This allows you to import third-party libraries and your own classes in a standardized way in your project.
• PSR-1 and PSR-2 coding style: Composer comes with a code compliance checker that ensures your code complies with PSR-1 and PSR-2 coding style standards. This helps improve code consistency and readability.
• PSR-3 logging: Composer supports the PSR-3 logging standard. This allows you to easily integrate different logging libraries in your project.

Practical case: Using Composer and the PSR standard

To show how Composer and the PSR standard work together, we use the following command to install a third-party that adheres to the PSR standard Library:

composer require monolog/monolog

After the installation is complete, you can use Composer’s auto-loading function to import the library:

require_once 'vendor/autoload.php';

// 使用 Monolog 日志库
$logger = new Monolog\Logger('my-logger');
$logger->info('Hello, PSR!');

The code complies with the PSR-0 auto-loading standard and the PSR-1/PSR-2 code style standard .

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