PSR-17

PSR-17 is a PHP Standard Recommendation that defines a set of common interfaces for HTTP message factories, allowing developers to create HTTP request and response objects in a standardized way. It is part of the PHP-FIG (Framework Interoperability Group) standards, specifically focusing on HTTP factories to promote interoperability between PHP frameworks and libraries. By providing these interfaces, PSR-17 ensures that different components can work together seamlessly when handling HTTP messages.

Also known as: PSR17, PHP Standard Recommendation 17, HTTP Factories, PSR-17 HTTP Factories, PHP-FIG PSR-17

Why learn PSR-17?

Developers should learn and use PSR-17 when building or integrating PHP applications that require HTTP message handling, such as web frameworks, middleware, or API clients, as it enables code reusability and reduces vendor lock-in. It is particularly useful in projects that follow PSR-7 (HTTP message interfaces) for creating request and response objects, ensuring consistency across libraries like Guzzle, Symfony, and Laravel. Adopting PSR-17 simplifies dependency injection and testing by allowing interchangeable factory implementations.

Learning Resources

• docs: PHP-FIG PSR-17 Specification
• tutorial: PHP The Right Way - PSR Standards
• docs: Symfony Documentation on PSR-17
• tutorial: Laravel News - Understanding PSR-7 and PSR-17
• video: YouTube: PHP-FIG Standards Explained