Friendly urls problem with htaccess

[asanti]

I'm currently runing an classifieds ads site, Php + Mysql (no frameworks) Basically i have the ads listing page (ads.php) and the ads details page (ad_detail.php)

This is my current .htaccess:

# disable directory browsing

Options All -Indexes


ErrorDocument 400 /error.php

ErrorDocument 401 /error.php

ErrorDocument 403 /error.php

ErrorDocument 404 /error.php

ErrorDocument 500 /error.php

ErrorDocument 502 /error.php

ErrorDocument 504 /error.php


RewriteEngine on


RewriteRule ^(.*)-da([0-9]+)$ ad_detail.php?ad=$2

RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^([^\.]+)$ $1.php [NC,L]


RewriteRule ^([^\.]+)$ $1.php [NC,L]

The final result is something like this:

www.mysite.com/this-is-the-ad-detail-da50555 (the number is the ad id)

 

What i need is to get this:

www.mysite.com/ads/another-ad-detail-da50777

+

What can i do in others urls to show like www.mysite.com/about/ instead of www.mysite.com/about (without the /)

 

 

I already tried this but doesn't work:

RewriteEngine on

RewriteBase /


RewriteRule -da([0-9]+)/?$ ad_detail.php?ad=$1 [L,QSA]


RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{DOCUMENT_ROOT}/$1\.php -f [NC]

RewriteRule ^(.+?)/?$ $1.php [L]