Restler is a simple and effective multi-protocol REST API Server written in PHP. Just deal with your business logic in php, restler will take care of the REST!

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• Taking Care of the REST - Presentation
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• Light weight
• Flexible
• Customizable
• Supports HTTP request methods GET, POST, PUT, and DELETE
• Clients can use X-HTTP-Method-Override header
• Two way format conversion
• Pluggable Formatters
• Comes with JSON, XML, Yaml, Amf, and Plist(both XML and Binary) formats
• Pluggable Authentication schemes
• Comes with many Examples that can be tried on your localhost to get started
• URL to Method mapping
• URL part to Method parameter mapping
• Supports URLEncoded format for simplified input
• Query parameters to Method parameter mapping
• Source code distributed under LGPL

Restler 2.0 is a major rewrite to use convention over configuration and it is optimized for performance. Here are some of the major changes and improvements

• PHPDoc comments to map a method to URI is now optional.
• All public methods that does not begin with an underscore are mapped automatically to the method name (gateway\classname\methodname\param1\...)
• If we do not specify the second parameter for $restler->addAPIClass it will be mapped to the class name instead of mapping it to the root
• Restler 2 is written for PHP 5.3 and above but it make use of compat.php and work on any version of PHP starting from PHP 5.0

more information is available on the features page