Should I learn PHP?

As long as you want to...YES! There is not a person I can think of that would not benefit from the ability to post their own dynamic resume online, or have the capability to list their products or services on the World Wide Web (www). With knowledge of PHP you could do everything from running an Ebay Clone, to managing a Photography site, to building the next Xanga. Don't get me wrong though, you don't have to start the next Hotmail to find a use for PHP! It is just as important for giving small sites the leverage to succeed online.