Mini Shell

<?php
    include '../db/database.php'; 
    $year = $_POST['year'];
    $class_name = $_POST['class_name'];
    $lc_id = $_POST['lc_id'];
    $course_id = $_POST['course_id'];
   

 
    //เช็ค Username ซ้ำกันหรือไม่
    $sql_class = "SELECT class_name FROM class_room WHERE class_name='$class_name' AND academic_year='$year'";
    $result_class = mysqli_query($link2, $sql_class);
    $is_class = mysqli_num_rows($result_class);
    if ($is_class == 1) {
        header('Content-Type: application/json');
        $errors = "ห้องเรียนนี้มีอยู่แล้วในระบบ" . mysqli_error($link);
        echo json_encode(array('status' => 'danger','message' => $errors));
        exit;
    }
    
  
    
    $sql = "INSERT INTO `class_room` (`class_name`,`lc_id`,`academic_year`,`course`) VALUES 
          ('$class_name','$lc_id','$year','$course_id')";
    $result = mysqli_query($link2, $sql);
    
    if ($result) {
        header('Content-Type: application/json');
        echo json_encode(array('status' => 'success','message' => 'บันทึกข้อมูลเรียบร้อยแล้ว'));
    } else {
        header('Content-Type: application/json');
        $errors = "เกิดข้อผิดผลาดไม่สามารถบันทึกข้อมูลได้" . mysqli_error($link);
        echo json_encode(array('status' => 'danger','message' => $errors));
    }