@anubhava provided an excellent answer for my previous question of doing an .htaccess internal rewrite with the below code, which worked for my one search query.
RewriteCond %{ENV:REDIRECT_STATUS} ^$
RewriteCond %{QUERY_STRING} id=([0-9]+) [NC]
RewriteRule ^file\.php$ /directory/%1? [R=301,L,NC]
RewriteRule ^directory/(\d+)/?$ /directory/file.php?id=$1 [L,QSA,NC]
I wanted to make this a separate question since my next question is slightly different. How could I adapt this to also work with two parameters? For instance, I would also like http://ipaddress/directory/file.php?id=47?name=value1 to redirect to http://ipaddress/directory/47/value1
name= can also be any combination of letters and numbers, like value1050, etc.
Thank you @anubhava for your previous answer above, and maybe there's a way to add on this second parameter as well?