Java.php is a project mainly written in PHP, it's free.
Java ported to PHP OOP
Java Objects ported to PHP, as well as specific methods / functions.
Essentially the entire reason is because I can, however there are a lot of reasons behind this.
A few pertain to how PHP doesn't follow any standards regarding function naming, and that is only the tip of the iceberg.
So instead of arguing, I'm simply going to do / prove that it is possible.
All code is / must be licensed under the AOL.
java.php is brought to you by Nijikokun, and inspiration from the Java team, as well as PHP.