Forum Moderators: phranque
Are you trying to make your URLs more search-engine friendly?
If so, put links like "/13-11.html" on your php pages.
Then use mod_rewrite to rewrite those URLs, when requested by browsers and search engine spiders, back to the form index.php?c=13&s=11
(mod_rewrite works after an HTTP request is received, but before the content handler is invoked to serve pages or run scripts. Therefore, mod_rewrite can change incoming, but not outgoing, URLs.)
So normally, rewrites are done in the "opposite direction" from what you are asking for.
Either way, a search for 'rewriterule "search engine friendly" URL' or 'rewriterule static dynamic' should turn up a lot of posts here on how to do it. Also, our charter [webmasterworld.com] contains some helpful links.
Jim