problem in decoding htaccess url rewrite values

i have written a code in .htaccess

RewriteEngine on
RewriteRule ^category-search/(.*)$ category-search.php?cat_id=$1

and my current URL is

www.mydomain.com/category-search/=NA==

Last values (=NA==) is encoded in base64_encode. But when i m trying to fetch this values in php like...

$val=mysql_real_escape_string(base64_decode($_REQUEST['cat_id']));

I am getting $val equal to 开发者_JS百科nothing. What is error behind this ?

When i was not rewrite in htaccess this was working well.

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=NA== is not a valid base64-encoded string (wrong length and invalid character at the beginning). Did you mean NA64==? That decodes to 4.

In case of =NA==, base64_decode() would return false, which outputs as empty string.

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shouldn't you be looking at $_REQUEST['cat_id'] instead of $_REQUEST['sub_cat_id'] as that is what you have called the request parameter in the .htaccess file...