htaccess 和 CMS 的 URL 问题

Question

I've developed my own CMS in PHP and now I'd like to make it SEO-Friendly, but I'm having some problems.

Most of the pages of the website are accessible from a id, like:

www.example.com/?id=alphanumericId123
www.example.com/?id=main

and so on, and I'd like to rewrite the URL of this pages:

www.example.com/aplhanumericId/
www.example.com/main/

I have wrote this rewrite rule, and it works fine:

RewriteEngine On
RewriteRule ^([^/d]+)/?$ index.php?id=$1 [QSA]

but It cannot work for those few pages that are accessible by a static file or just for the scripts.
Isn't there a way to make some exceptions? Like:

if the requested file exsist {
    if it is protected {
        display error 403
    } else {
        display file
} } else {
    rewrite rule
}

Answer 1

You should not rewrite paths to existing files and directories:

RewriteEngine On
# Exclude existing files
RewriteCond %{REQUEST_FILENAME} !-f
# Exclude existing directories
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/d]+)/?$ index.php?id=$1 [QSA]

Also note that your rule will not allow you alphanumeric id's as you are excluding numbers.

Alternatives would be:

...
# No forward slash
RewriteRule ^([^\/]+)/?$ index.php?id=$1 [QSA]

or

...
# Only a selection of characters including - and _
RewriteRule ^([-\w]+)/?$ index.php?id=$1 [QSA]

Answer 2

Use the following before your RewriteRule

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

Basically it checks if it's not a file, and not a directory.