Using middleware to cross languages
Except in cases where you are trying to communicate between different versions of PHP, PSR-7 middleware will be of minimal use. Recall what the acronym stands for: PHP Standards Recommendations. Accordingly, if you need to make a request to an application written in another language, treat it as you would any other web service HTTP request.
How to do it...
- In the case of PHP 4, you actually have a chance in that there is limited support for object-oriented programming. Accordingly, the best approach would be to downgrade the basic PSR-7 classes described in the first three recipes. There is not enough space to cover all the changes, but we present a potential PHP 4 version of
Application\MiddleWare\ServerRequest. The first thing to note is that there are no namespaces! Accordingly, we use a classname with underscores, _, in place of namespace separators:class Application_MiddleWare_ServerRequest extends Application_MiddleWare_Request implements Psr_Http_Message_ServerRequestInterface...
