[wing328hk]

Per the SDKs ...

If you've a Swagger/OpenAPI spec, you can use Swagger Codegen (https://github.com/swagger-api/swagger-codegen), a free and open-source project, to generate API clients (SDKs) in C#, Ruby, PHP, Java, ObjC, etc.

Here is an example: https://github.com/wing328/petstore-php

You can also use Swagger Codegen to generate server stub in SpringMVC, PHP Slim and more.

Disclosure: I'm a top contributor to Swagger Codegen.

(To convert RAML, API blueprint, WSDL, etc to Swagger/OpenAPI spec 2.0, please try https://github.com/lucybot/api-spec-converter - an open-source converter written in NodeJS)