PHP is a commonly used scripting language available on just about any OS. If you're looking to install PHP on Ubuntu (particularly the new 11.04 build) then you may come across some issues. Nigel Dunn discusses his experience with PHP on Ubuntu. Nigel has some tricks to get everything up and running so it might save you save yourself alot of time. The issues are surrounding libjpeg & libpng and php Installation issues. The problem appears to be largely around symbolic links.