Guzzle vs Zend Framework: What are the differences?

What is Guzzle? PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services. Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services.

What is Zend Framework? An open source, object-oriented web application framework implemented in PHP 5. Zend Framework 2 is an open source framework for developing web applications and services using PHP 5.3+. Zend Framework 2 uses 100% object-oriented code and utilises most of the new features of PHP 5.3, namely namespaces, late static binding, lambda functions and closures.

Guzzle and Zend Framework are primarily classified as "Microframeworks (Backend)" and "Frameworks (Full Stack)" tools respectively.

Guzzle and Zend Framework are both open source tools. It seems that Guzzle with 16.9K GitHub stars and 1.94K forks on GitHub has more adoption than Zend Framework with 5.71K GitHub stars and 2.87K GitHub forks.

Webedia, Scandlearn, and MV Labs are some of the popular companies that use Zend Framework, whereas Guzzle is used by Wireless Logic, Cherry, and Prombox. Zend Framework has a broader approval, being mentioned in 39 company stacks & 22 developers stacks; compared to Guzzle, which is listed in 10 company stacks and 7 developer stacks.