Adam Bard has written up a post that takes the same small application (a "Nurblizer") and writes it as a web application in four different languages - PHP, Python, Ruby and Clojure. His point is less about which is "best" but more to show the differences between them.
Here's a toy program I wrote implemented in PHP, Python, Ruby, and Clojure. I hope it's helpful for someone who knows at least one of those and wants to learn another. The program is called "Nurblizer", and it does one thing: Accept free-form text, and attempt to replace all words but the nouns in said text with the word "nurble". It's up and running at http://nurblizer.herokuapp.com
He includes the source for each language's version using Sinatra for Ruby and Flask for Python but for PHP and Clojure it's just straight code. For each he briefly explains what its doing and a bit about how it relates to the examples from the other languages. He also points out a Hacker News discussion that's popped up about the examples.