How do i query for mutual friends?

maly2g5

I have table friends **and table **users

Lets says a current user visit another user's profile and the profile id is 27

$user_id = $_GET['id'];

then I click on a link to view the friends of this user(27)

so now his friends are:

18 and 33

Note: user 18 is the current loggedIn user

Please how can I query database if current(18) user is also friends with user 33??

B00

Same way you found friends of id 27.