อยากเปลี่ยนจาก drop-down เป็น ตาราง check list ตรงรายชื่อนักเรียนคับ

<?php include('header.php');?>
<div id="page-wrapper">
    <div class="container-fluid">
        <div class="row bg-title">
            <div class="col-lg-3 col-md-4 col-sm-4 col-xs-12">
                <h3 class="page-title">เพิ่มข้อมูลห้องเรียน</h3>
            </div>
            <!-- /.col-lg-12 -->
        </div>
        <div class="col-md-12 col-sm-12">
            <div class="white-box">

                <div class="row">
                    <div class="col-sm-12 col-xs-12">
                        <form method="post">
                            <div class="form-group">
                                <label for="school_id">โรงเรียน</label>
                                <div class="input-group">
                                    <div class="input-group-addon"><i class="ti-pencil-alt"></i></div>
                                    
                                <select class="form-control" name="school_id" id="school_id">
                                        <?php
                                            $sql=" select * from tb_school";
                                            $result=$cls_conn->select_base($sql);
                                            while($row=mysqli_fetch_array($result))
                                            {
                                                ?>
                                         <option value="<?=$row['school_id'];?>"><?=$row['school_year'];?></option>
                                            <?php
                                                }
                                            ?>
                                       
                                    </select>
                                </div>
                            </div>

                            <div class="form-group">
                                <label for="teacher_id">ครู</label>
                                <div class="input-group">
                                    <div class="input-group-addon"><i class="ti-pencil-alt"></i></div>
                                    
                                <select class="form-control" name="teacher_id" id="teacher_id">
                                        <?php
                                            $sql=" select * from tb_teacher";
                                            $result=$cls_conn->select_base($sql);
                                            while($row=mysqli_fetch_array($result))
                                            {
                                                ?>
                                         <option value="<?=$row['teacher_id'];?>"><?=$row['teacher_name'];?></option>
                                            <?php
                                                }
                                            ?>
                                       
                                    </select>
                                </div>
                            </div>
                            
                            <div class="form-group">
                                <label for="room_id">ระดับชั้น</label>
                                <div class="input-group">
                                    <div class="input-group-addon"><i class="ti-pencil-alt"></i></div>
                                    
                                <select class="form-control" name="room_id" id="room_id">
                                        <?php
                                            $sql=" select * from tb_room";
                                            $result=$cls_conn->select_base($sql);
                                            while($row=mysqli_fetch_array($result))
                                            {
                                                ?>
                                         <option value="<?=$row['room_id'];?>"><?=$row['room_primary'];?></option>
                                            <?php
                                                }
                                            ?>
                                       
                                    </select>
                                </div>
                            </div>
                                                                                
                            <div class="form-group">
                                <label for="student_id">รายชื่อนักเรียน</label>
                                <div class="input-group">
                                    <div class="input-group-addon"><i class="ti-pencil-alt"></i></div>
                                    
                                <select class="form-control" name="student_id" id="student_id ">
                                        <?php
                                            $sql=" select * from tb_student";
                                            $result=$cls_conn->select_base($sql);
                                            while($row=mysqli_fetch_array($result))
                                                
                                            {
                                                
                                                ?>
                                         <option value="<?=$row['student_id'];?>"><?=$row['student_prename'];?><?=$row['student_firstname'];?> <?=$row['student_lastname'];?></option>
                                            <?php
                                                }
                                            ?>
                                       
                                    </select>
                                </div>
                            </div>

                            <button type="submit" name="submit" class="btn btn-success waves-effect waves-light m-r-10">Submit</button>
                            <button type="reset" name="reset" class="btn btn-inverse waves-effect waves-light">Cancel</button>
                        </form>
                        <?php 
                                    if(isset($_POST['submit']))
                                    {
                                        $school_id=$_POST['school_id'];
                                        $teacher_id=$_POST['teacher_id'];
                                        $room_id=$_POST['room_id'];
                                        $school_id=$_POST['school_id'];
                                        $student_id=$_POST['student_id'];
                                        
                                        $sql=" insert into tb_classroom(school_id,teacher_id,room_id,student_id)";
                                        $sql.=" values ('$school_id','$teacher_id','$room_id','$student_id')";
                                        if($cls_conn->write_base($sql)==true)
                                        {
                                            echo $cls_conn->show_message('บันทึกข้อมูลสำเร็จ');
											echo $cls_conn->goto_page(1,'show_classroom.php');
                                        }
                                        else
                                        {
                                             echo $cls_conn->show_message('บันทึกข้อมูลไม่สำเร็จ');
                                             echo $sql;
                                        }
                                    }
                                    
                                    ?>
                    </div>
                </div>
            </div>
        </div>

    </div>
    <!-- /.container-fluid -->
</div>
<?php include('footer.php');?>