I've used a few different CSS/JS bundlers, but none have ever fulfilled all that I needed. [...] Thus, I created bundle-phu. Bundle-phu is a set of Zend Framework view helpers that do all of the above. Bundle-phu is inspired by, bundle-fu a Ruby on Rails equivalent. [...] It automagically concatenate, minify, and gzip your javascript and stylesheets into bundles. This reduces the number of HTTP requests to your servers as well as your bandwidth.

He includes how to install it, how to use it in your code and what the end result is when you view the actual HTML source. You can check out the latest version from the project's github account.