languages needed to create theme

what language do i need to learn to be able to create custom opencart themes. I already know html/xhtml and css. I suspect know i need php but do i need any others?

also where is the best place to learn php for free?

rcmonger wrote:what language do i need to learn to be able to create custom opencart themes. I already know html/xhtml and css. I suspect know i need php but do i need any others?

mostly just html and css. Just work around the php tags that are embedded

rcmonger wrote:also where is the best place to learn php for free?

The internet