This isn't really 'code,' but it's similar to code.
If you have include directories, template directories, or other private directories, why allow users to access them? Instead, use mod_rewrite!
If you have include/ and want to hide it, add this to your .htaccess file:
Code:
RewriteEngine On
RewriteRule ^include$ /dev/null
RewriteRule ^include/(.*)$ /dev/null
You can use that again, but just remove "RewriteEngine On" and change "include" to the directory you want to hide.
10,000,000 in 10,000,001 servers have mod_rewrite.
I would also like to note that all PHP scripts or Perl scripts can access the files, even with this.