As we all know joins play an important role in any project . So Laravel 4.x also provide Eloquent Query Builder in which we are able to use Complicated joins with variable.This can be easily explain by using example

Example:

I managed to fix this myself, there's a note at the bottom of why it's not completely optimal but here's how to do it anyway:

public function scopeJoinUserData($query, $user_id)
{
    return $query->leftJoin('content_userdata', function($join) use ($user_id)
    {
        $join->on('content_userdata_content_id', '=', 'content.content_id')->on('content_userdata_user_id', '=', DB::raw('"'.$user_id.'"'));
    });
}

Performance: One thing to note is that MySQL queries can be considerably faster when using an integer rather than a string and will interpret it as a string if it's wrapped in quotes. I'm not worrying about that for now, but I figured I should mention it if others are using this as a solution.

For join we will also use DB::raw() by this we can also perform join by writing direct mysql query.