GraPHP vs Zend Framework: What are the differences?

GraPHP: A PHP graph DB web framework *. The goal of this project is to build a lightweight web framework with a graph DB abstraction. It should be very easy to create the graph schema with no knowledge of of how the data is stored. Also, the schema should be incredibly flexible so you should never need migrations when adding new models (nodes), connections (edges), or data that lives in nodes; *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.

GraPHP and Zend Framework can be categorized as "Frameworks (Full Stack)" tools.

GraPHP and Zend Framework are both open source tools. It seems that Zend Framework with 5.71K GitHub stars and 2.87K forks on GitHub has more adoption than GraPHP with 135 GitHub stars and 5 GitHub forks.