php - suggesting friends that are not already a friend with the user -

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i want suggest friends user. need validate if friend suggesting not friend user
have 2 tables called user, friendship

i try code can't proceed coz have no more idea

$sql=“select user.fullname,user.userid users user. userid not       in( select * friendship userid = '$userid') “;

i'm using php , mysql

try friendship.userid

$sql = "select user.fullname,user.userid users user. userid not   in( select friendship.userid friendship userid = '$userid')";

you need check userids friends of user


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