Zend

Zend Framework is open-source software framework for PHP 5 that eliminates tedium and helps you look at the big picture. Currently Zend Framework is in preview release which means components will change but they are telling everyone that these will be minor. A list of the Zen components can be found on the download page.

http://framework.zend.com
Zend Tutorials:
http://www.zftutorials.com/

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