Apache mod rewrite url htaccess

Question

I am a little bit confused and still learning on how to rewrite in Apache htaccess

How can I turn this:

http://www.mydomain.com/dir1/post.php?%20id=1

into this:

http://www.mydomain.com/category1/post/1

This is my reference, I'm not sure if I am doing it correctly

<a href='http://www.mydomain.com/dir1/post.php? id=$id'>

Answer 1

You can use a simple rewrite rule if you only need to rewrite a single URL.

RewriteRule ^dir1/post.php?%20id=1 category1/post/1 [L]

or you may need to replace the %20 with the whitespace character regex

RewriteRule ^dir1/post.php?[\s]id=1 category1/post/1 [L]

You will need to make sure mod_rewrite is on as well ('RewriteEngine On' in .htaccess).

Here is a good tut: http://coding.smashingmagazine.com/2011/11/02/introduction-to-url-rewriting/