How to set HTTP headers (for cache-control)?

How to enable browser caching for my site? Do I just put cache-control:public somewhere up in my header like this?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
Cache-Control:public;
>

I am using the latest version of PHP developing on the latest version of XAMPP.

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