Htaccess如何解析到相同的URL

Question

我有一个动态网站PhotographyAttic 使用我的htaccess文件中的以下代码

RewriteEngine on
RewriteBase /  

#Make dynamic url neater  
RewriteRule ^category-(.*)  category.php?catid=$1 
RewriteRule ^manufacturer-(.*)  manufacturer.php?manuid=$1
RewriteRule ^product-(.*)  product.php?id=$1  


#remove.php from end of url 
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]

#force www
Options +FollowSymLinks  
RewriteCond %{HTTP_HOST} !^www.photographyattic.com$ [NC]
RewriteRule ^(.*)$ http://www.photographyattic.com/$1 [L,R=301]

如何修复以下错误

  

http://www.photographyattic.com/category.php?catid=9和http://photographyattic.com/category.php应解析为相同的网址，但目前不会。