Quickest way to rewrite urls to lowercase?

I'm looking f开发者_StackOverflow中文版or a way, preferably with .htaccess to rewrite a url when a user types in something with a capital.

For example, the url could be website.com/pagename

and the usertypes in website.com/PageName or website.com/PAGENAME

Whats the best way to do with without slowing down page load?

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You can either do an HTTP redirect (via Apache):

RewriteEngine on
RewriteMap lowercase int:tolower
RewriteCond $1 [A-Z]
RewriteRule ^/(.*)$ /${lowercase:$1} [R=301,L]

or do the processing in PHP:

$_SERVER['REQUEST_URI']=strtolower($_SERVER['REQUEST_URI']);

HTTP redirection isn't really as efficient as the PHP solution.