Zend

Zend Framework is a collection of professional PHP packages with more than 112 million installations. Zend can be used to develop web applications and services using PHP 5.6+, and provides 100% object-oriented code using a broad spectrum of language features.

Zend Framework uses Composer as a package dependency manager; PHPUnit to test all packages; and Travis CI as a Continuous Integration service. Zend Framework also follows PHP-FIG standards, and includes an implementation of PSR-7 for HTTP message interfaces (as shepherded by Matthew Weier O'Phinney, Zend Framework project lead).Zend Framework 3 evolved from both Zend Framework 2 and 1; cumulatively, the previous versions were downloaded more than 15 million times.

The principal sponsor of Zend Framework is Zend, a Rogue Wave Company, but many others have contributed components or significant features to the framework. Companies such as Google, Microsoft, and StrikeIron have partnered with Zend to provide interfaces to web services and other technologies they wish to make available to ZF developers.