.htaccess rewrite three filenames into two directories - php

Question

I am having some problems with using .htaccess to rewrite three filenames.
Basically the url: domain.com/post.php?category=uncategorized&title=title-of-post&id=1
should be rewritten as
domain.com/uncategorized/title-of-post-1
I worked out how to just rewrite one of the filenames (such as the categorized part) but how do I do all three, so that the category will be in one directory, and the second directory will be a merge of the title and id separated by a dash?
This is my code so far:
Options +FollowSymlinks
RewriteEngine on
# add a trailing slash
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{THE_REQUEST} \s/+(.*?)[^/][?\s]
RewriteRule [^/]$ %{REQUEST_URI}/ [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([\w\d~%.:-]+)/?$ category.php?id=$1 [L,QSA]
I also need the URL to end with a slash. If it is not, it will redirect to it.

Answer 1

You can insert a new rule for post.php:
Options +FollowSymlinks
RewriteEngine on
# add a trailing slash
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{THE_REQUEST} \s/+(.*?)[^/][?\s]
RewriteRule [^/]$ %{REQUEST_URI}/ [L,R=301]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([^/]+)/(.+?)-([^/-]+)/?$ post.php?category=$1&title=$2&id=$3 [L,QSA]
RewriteRule ^([^/]+)/?$ category.php?id=$1 [L,QSA]