Can websites like YouTube and MySpace be coded using PHP?
Yes! YouTube is actually mostly written in Python. Many major web sites like Digg and Facebook are written in PHP. In fact, YouTube clones such as videobroadcastscript.com and rayzz.net were already made using PHP. Phyton is used server-side which means that the client wont see any of these actions. Php is used client-side to generate the page which is send to the user's browser.