PSRHTTPMessage

PSR-HTTP-Message is a specification that defines a standard interface for HTTP messages in PHP. It was developed by the PHP-FIG (PHP Framework Interoperability Group) to promote interoperability between different PHP projects and libraries. The specification outlines interfaces for representing HTTP requests and responses, including their headers, body, and status codes.

The core interfaces defined by PSR-HTTP-Message are RequestInterface and ResponseInterface. RequestInterface provides methods for accessing and manipulating HTTP request details such as the HTTP method, URI, server parameters, and request body. ResponseInterface offers similar functionality for HTTP responses, including methods for setting the status code, headers, and response body.

By adhering to PSR-HTTP-Message, developers can ensure that their HTTP handling code is compatible with a wide range of other PHP libraries and frameworks that also implement the standard. This promotes code reusability and reduces the effort required to integrate different components within a PHP application. For example, a middleware component designed to work with PSR-HTTP-Message can be easily plugged into any framework that supports the standard, without needing to be rewritten.

The specification also defines interfaces for streams (StreamInterface) to handle message bodies in a consistent and efficient manner, supporting operations like reading, writing, and seeking within the body data. The adoption of PSR-HTTP-Message has significantly improved the quality and interoperability of the PHP ecosystem, making it easier to build complex and maintainable web applications.