Building RESTful API with Laravel [Video], published by Packt
The simplest PHP Wrapper for Twitter API v1.1 calls
A SDK for building PHP applications/websites that interact with the KAZOO APIs
An extremely simple API (with authentication) example, written in PHP (server) and JS (client), using JSON
PHP Wrapper for the Help Scout API
Build an API with Laravel 5
A simple PHP GitHub API client, Object Oriented, tested and documented.
Two simple tools for building REST APIs with Fractal: console generator and API skeleton
Example of REST API with Slim PHP Framework.