Kohana is a PHP 5 framework that uses the Model View Controller architectural pattern. It aims to be secure, lightweight, and easy to use. Although it reuses many common design patterns and concepts, there are some things that make Kohana stand out. It is community driven, uses strict PHP 5 OOP to provide visibility protection, automatic class loading, overloading, interfaces, abstracts, and singletons, and is extremely lightweight. Kohana has no dependencies on PECL extensions or PEAR libraries. Large, monolithic libraries are avoided in favor of optimized solutions.
Zend Framework is a framework for PHP 5 that is based on simplicity, object-oriented best practices, corporate friendly licensing, and a rigorously tested agile code base. It is focused on building more secure, reliable, and modern Web 2.0 applications and Web services, and consuming widely available APIs from leading vendors like Google, Amazon, Yahoo!, and Flickr, as well as API providers and cataloguers like StrikeIron and ProgrammableWeb.
Probus is a Web framework for developing in PHP5. This framework is based on the MVC pattern. It has excellent support data caching and provides convenient AJAX support. This framework supports the following features: Many programming patterns can be used, include MVC. A simple command-line tool is used to generate projects. Standard plugins are included for AJAX, RSS, and form validation. It is simple create new plugins for Probus. Its database abstraction layer supports MySQL, PgSQL, MSSQL, Oracle, and many others. It automatically caches data. Its configuration system uses YAML syntax. Components can be used from external frameworks such as Zend Framework, symfony, Code Igniter, Kohana, and CakePHP.