AJAX not updating MySql data

Question

I have created this PHP script to update the status of users. I am having some difficulty while running the below code. The code of the page is given below: -

    $query = "DELETE FROM users WHERE id='$id' ";
    $query_run = mysqli_query($conn, $query);

    if($query_run)
    {
        $_SESSION['status'] = "Successfully Deleted";
        header('Location: index.php');
    }
    else
    {
        $_SESSION['status'] = "Something Went Wrong.!";
        header('Location: index.php');
    }

The query here fails to run. The below ajax code sends the data to this page using a POST request

$.ajax({
            type: "POST",
            url: "code.php",
            data: {
                    'checking_edit_btn': true,
                    'student_id': stud_id,
                      },
            success: function (response) {
            $.each(response, function (key, value) { 
            $('#edit_id').val(value['id']);
            });
            $('#editStudentModal').modal('show');
            };
            });

update It's working now, here is the final code:

$.ajax({
        type: "POST",
        url: "code.php",
        data: {
               'delete_student': true,
                'student_id': stud_id,
                  },
        success: function (response) {
        $.each(response, function (key, value) { 
        $('#edit_id').val(value['id']);
        });
        $('#editStudentModal').modal('show');
        };
        });

Answer 1

where you sending 'update_student'/'delete_student'?

try to add to data

update_student: true

or

delete_student: true

depends on button