htaccess rewrite doesn't work - .htaccess

Question

I'm new with htaccess and with a little help I could write this, but I'm having some problems and I don't know how to solve them
# General setup
RewriteBase /
RewriteEngine on
Options -Indexes
CheckSpelling off
# rewrite php
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
RewriteCond %{THE_REQUEST} \ /+([^\?\ ]+)\.php
RewriteRule ^ /%1 [L,R=301]
# rewrite html
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html
RewriteCond %{THE_REQUEST} \ /+([^\?\ ]+)\.html
RewriteRule ^ /%1 [L,R=301]
# error pages
ErrorDocument 404 error
Problems:
I'd like to transform somefile?var=value to somefile/value and it doesn't work
If I write somefile/anything I get somefile without css style instead of being redirect to the error page
As I'm new with htacess I don't know if that file is secure enough
What I'd like:
Redirect any extension to a filename file (with no extension)
Protect my htaccess and directory and files
redirect any users?id=id_user to users/username
Do you know any way to construct the htaccess online? or Do you have any idea or advice to give me?
Thank you!!!!!!

Answer 1

You're not getting CSS probably because your links are relative URLs, and when you have multiple paths in your URL, the relative links all break. You can try adding this to your page headers:
<base href="/" />
The somefile/anything is because the -f together with `%{REQUEST_FILENAME} actually checks for path info requests, so you want to use this instead:
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI}\.php -f
and
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI}\.html -f
For values, try adding this before your other rules:
RewriteCond %{THE_REQUEST} \ /+([^\?\ ]+)\.php\?var=([^&\ ]+)&?([^\ ]*)
RewriteRule ^ /%1/%2?%3 [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ^/(.+)/([^/]+)$
RewriteCond %{DOCUMENT_ROOT}/%1.php -f
RewriteRule ^(.+)/([^/]+)$ /$1.php?var=$2 [L,QSA]
For users, you're not going to be able to use htaccess because the URL /users?id=userid does not contain the username. Mod_rewrite has no idea what user ID maps to what user name. You'll need to do this using a php script (like users.php).