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followers with following flag

$followers=DB::table('user_followers as f')->join('users as u', 'u.id', '=', 'f.follower_id')
            ->leftJoin('user_followers AS b', function($join){
                $join->on('b.follower_id', '=', 'f.leader_id')
                     ->on('b.leader_id', '=', 'u.id');
            })
            ->selectRaw(DB::raw("u.user_id,u.full_name,u.username,u.avatar,
            case when b.follower_id is null then 0
                when b.follower_id is not null and  b.status=1 then 1
            else 2
            end as isFollowing,
            case when b.follower_id is null then 'Follow'
                when b.follower_id is not null and  b.status=1 then 'Pending'
            else 'Following'
            end as isFollowing
            "))
            ->where("f.leader_id",$authUserId)
            ->paginate(5);
            ;
-----------------------------------------
Mysql
----------------------------------

 SELECT 
    u.id,
    u.username,
    f.status,
    case when b.follower_id is null then -- No record in b if 3 didn't follow this user back.
       'User is not following back'
    else
       'User is following back'
    end as back
FROM 
    user_followers f -- IDs of followers of user 3
    INNER JOIN users u  -- User information of those followers
       ON u.id = f.follower_id
    LEFT JOIN user_followers b  -- Check if 3 follows them back.
       ON b.follower_id = f.leader_id and
          b.leader_id = u.id
WHERE
    f.leader_id = 582

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