PHP

From Applepedia

PHP is a legacy web technology that's also a programming language with like 50,000 functions (including favorites such as mysql_real_escape_quotes(), strrev(), string_reverse(), and date_sunset()) that aren't organized in any way. One of the main uses of PHP is providing SQL injection holes to users of your sites. You can also write buggy forum software, homebrew content management systems that are 10 kinds of broken, or follow the latest trend, which is to make a bloated Rails ripoff that misses the point.