They talk about things like explicit interfaces vs. duck typing, function calling vs. message passing, and some of the recent RFCs around optional typing in the PHP community.

This episode is brought to you by Hired.

• J#
• Hack
• DHH's "Why Ruby?" Keynote at RubyConf X
• Design by Contract in Eiffel
• Type Hinting in PHP
• PHP RFC: Scalar Type Hints
• PHP RFC: Sum Types
• Erie Day of Code
• EmberGrep
• Hired