It’s a classic Hollywood plot: the battle between two old friends who went separate ways. Often the friction begins when one pal sparks an interest in what had always been the other pal’s unspoken domain. In the programming language version of this movie, it’s the introduction of Node.js that turns the buddy flick into a grudge match: PHP and JavaScript, two partners who once ruled the Internet together but now duke it out for the mind share of developers. In the old days, the partnership was simple. JavaScript handled little details on the browser, while PHP managed all the server-side tasks that existed between port 80 and MySQL. It was a happy union that continues to support many of the crucial parts of the Internet. Between WordPress, Drupal, and Facebook, people can hardly go a minute on the Web without running into PHP.