There are many PHP frameworks that can be used to create REST APIs, but not all are easy to learn or well-suited for API development. Lumen is a fast and elegant micro-framework specifically designed for APIs, with 93 releases and an active community of over 2k active questions on StackOverflow tagged lumen. Guzzle is another popular PHP framework that makes it easy to send HTTP requests and integrate with web services, with 124 releases and 313 contributors. Slim is a simple yet powerful framework that helps you quickly write simple yet powerful web applications and APIs, with 96 releases and an active community of over 2600 questions tagged slim. Other notable PHP frameworks for REST API development include Leaf PHP, Swoft, Ubiquity, and Fat Free Framework, each with their own strengths and weaknesses. Ultimately, the best PHP framework for REST API development will depend on your specific needs and preferences.