On his blog, Karl Katzke has posted his own comparison of two of the popular PHP frameworks available for developers - Symfony and the Zend Framework.

The Symfony and Zend frameworks are so amazingly different that they almost don't deserve to share the title "framework." [...] Both frameworks are PHP5-native frameworks and won't function in PHP4. Both are heavily object-oriented and make use of inheritance that's only offered in PHP>5. Both use the front controller model. The similarities end there.

He compares them on a few levels:

• Getting Started
• Unit Testing
• Templating
• Plugins
• Database Modules

Be sure to check out his conclusion for his personal choice - we won't spoil it here.