So I'm checking to see that a "tag" has expired 7 days ago. But I also want to make sure that there aren't any other tags that are still valid within the same query. So, if there are other tags connected to the user that the tag is "active = 1" AND expiry_date is still in the future (tomorrow, at least), ignore that users tags altogether.

I've got the first part working fine:

$seven_days_ago_start = date('Y-m-d', strtotime('-7 days')) . ' 00:00:01';
$seven_days_ago_end = date('Y-m-d', strtotime('-7 days')) . ' 23:59:59';

$expired_tags = DB::table('tags')
        ->leftJoin('users', 'tags.user_id', '=', 'users.id')
        ->leftJoin('pets', 'pets.id', '=', 'tags.pet_id')
        ->where('tags.active', '=', 1)
        ->whereBetween('tags.expiry_date', array($seven_days_ago_start, $seven_days_ago_end))
        ->select('users.id', 'users.username', 'users.email', 'users.first_name', 'tags.serial_number')
        ->get();