Mini Shell

<?php 
    include '../db/database.php';
    
    $year = $_POST['year'];
    $subject_id = $_POST['subject_id'];
    $subject_code = $_POST['subject_code'];
    $subject_name = $_POST['subject_name'];
    $credit = $_POST['credit'];
    $subject_class_id = $_POST['subject_class_id'];
    $course = $_POST['course'];
    
   
    
     $sql = "UPDATE `subject` SET  `academic_year`='$year',`subject_class_id`='$subject_class_id',`subject_name`='$subject_name',`credit`='$credit',`subject_code`='$subject_code',`course`='$course'  WHERE (`subject_id`='$subject_id')";
     $result = mysqli_query($link2, $sql);
     
   if ($result) {
         header('Content-Type: application/json');
         echo json_encode(array('status' => 'success','message' => 'แก้ไขข้อมูลเรียบร้อยแล้ว')); 
    } else {
        header('Content-Type: application/json');
        $errors = "เกิดข้อผิดผลาดไม่สามารถบันทึกข้อมูลได้" . mysqli_error($link2);
        echo json_encode(array('status' => 'danger','message' => $errors));
    }