Please see the official release notes here. In addition, 2.2 is the first official version to support Data Definition Language DDL queries, which limits the use of SQL92 data types to create tables. Additionally this version reduces dependencies. Version 2.2 is backward compatible with previous versions, please see ChangeLog for details.
Zend Framework (ZF) is an open source framework for developing web programs and services using PHP 5. ZF is implemented with 100% object-oriented coding. ZF's component architecture is unique in that each component has little dependence on other components. Such a loosely coupled structure allows developers to use components independently. We often call this “use-at-will” design.
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