beginners guide for php htaccess - php

Question

I have just started learning htaccess.
And i want to test one page :
I have one folder called "favs" and inside that i have a php file index and from that i am passing to the page gallery.php with querystring ID
so the url will be :
mainsite.com/favs/gallery.php?id=7
Now i want the url to be like :
mainsite.com/favs/7
and this is the code i write in .htaccess file :
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^([a-zA-Z0-9_-]+)$ gallery.php?id=$1
RewriteRule ^([a-zA-Z0-9_-]+)/$ gallery.php?id=$1
</IfModule>

Answer 1

Your rules are wrong. You have this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^([a-zA-Z0-9_-]+)$ gallery.php?id=$1
RewriteRule ^([a-zA-Z0-9_-]+)/$ gallery.php?id=$1
</IfModule>
^([a-zA-Z0-9_-]+)$ will match everything in the URL after the first slash, as long as there is no slash. There's a slash in mainsite.com/favs/7, so the rule doesn't match, and it looks for an actual directory named /favs/7. What you want is to match only the piece after favs, like this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^favs/([0-9]+)/?$ favs/gallery.php?id=$1
</IfModule>
The code above is what you should put in .htaccess if it is in your root directory. If it is in your /favs directory, then you need to remove the /favs from RewriteRule and add a RewriteBase like this:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /favs
RewriteRule ^([0-9]+)/?$ gallery.php?id=$1
</IfModule>
Note: based on your question, I have eliminated letters, _, and - from the regular expression. If you need to match them, you can tweak the rule above accordingly.

Answer 2

the is my full code :
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteEngine On
RewriteRule ^favs/([0-9]+)/?$ favs/gallery.php?id=$1
</IfModule>
and this is the url :
http://www.fullridescholarships.net/favs/