One of the fantastic things about the PHP language is that we, the community, are constantly evolving it. If you take a look at PHP code from just a few years ago, it can appear alien compared to anything written in modern PHP today. In fact, I’ve often stated that PHP was, in fact, unique among all the programming languages that exist currently. Yes, quite a few of them are open source; however, PHP is the only one truly embracing the open source concept. It is continuously changed, and not by a single gatekeeper but by a broad and vast team of engineers who use the language every day.