How use Laravel of concat with pluck method?

Some time we need concat multiple fields with pluck function in laravel

Here we describe how use multiple columns in pluck function use of concat

public function get_course()
{
$course_type = $_GET['course_type'];
$courseArray = DB::table('courses')->where(['status' => 0, 'course_type' => $course_type])
->orderBy('name', 'asc')
->pluck(DB::raw('CONCAT(name," -->",duration_in_month, " Months") AS name'),'id');
return json_encode($courseArray);
}