用htaccess重写url？page = 2到/ page / 2？

How can I rewrite my url, ONLY for the directory photos ?

http://www.abc.com/photos/index.php?page=2 to http://www.abc.com/photos/page/2

My .htaccess

# Turn mod_rewrite on
RewriteEngine on
RewriteBase /
...

RewriteRule ^photos/index.php?page=([0-9]*)$ /photos/page/$1 [R=301,L]

RewriteRule ^photos/page/([0-9]+) index.php?page=$1

RewriteEngine On
RewriteRule ^photos/page/([a-zA-Z0-9-/]+)$ photos/index.php?page=$1 [QSA]
RewriteRule ^photos/page/([a-zA-Z0-9-/]+)/$ photos/index.php?page=$1 [QSA]

You don't mention which strings are dynamic, so I am assuming for this answer that page and 2 are variable.

You may try this:

Options +FollowSymlinks
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !index\.php                 [NC]
RewriteCond %{REQUEST_URI} ^/photos/([^/]+)/([^/]+)/?  [NC]
RewriteRule .*      photos/index.php?%1=%2          [L,QSA]

Maps internally

http://www.abc.com/photos/key/val with or without trailing slash

To:

http://www.abc.com/photos/index.php?key=val

Strings key and val are assumed to be variable while photos is assumed to be fixed.

For permanent and visible redirection, replace [L,QSA] with [R=301,L,QSA].