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Which languages to code these sites

Last response: in Applications
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I'm lookin' for a quick rundown of coding langauges to make these websites:

1. youtube - users can post their own content (images or videos)
2. facebook - users can create profiles and put info and descriptions
3. ebay - people can post auctions
4. neweggs.com - people can purchse online and have a basket to list products they want to buy
5. digg - most popular stories go on front page
6. tom's hardware forums - custom forum like tom's

I'd like to learn some coding and need some orientation.

More about : languages code sites

I started learning HTML and CSS. It seems HTML is the where you put page design information and data whereas CSS is the glasses you use to see the site in a common theme (defining font colors, family, text size, things like that).

I guess this leaves PHP to do all the nifty tricks like accounts, uploading images, forums etc. Correct? Can php replace html and css entirely or do we use all 3?
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