CodeIgniter Marking checkboxes from database

I want to repopulate a page that contains checkboxes from values in the database. Currently, they are being stored as a string that gets split into an array when processing e.g 3,4,5.

I am able to check the boxes with the data from my database but another empty checkbox is created by its side. How do I only check the boxes with data from the database without having a duplicate empty box by its side?

<tbody>               
       <?php 
           if(!empty($datatable)){
              foreach ($datatable as $data){
        ?>
                    <tr>
                        <td>
                            <?php foreach ($event_contacts as $checked){?>
                                <?php if($checked==$data->id){?>
                                    <input type="checkbox" name="id[]" id="id" checked value="<?php echo $data->id; ?>"/>
                            <?php }else{ ?>
                                    <input type="checkbox" name="id[]" id="id" value="<?php echo $data->id; ?>"/>
                            <?php }}?>
                        </td>
                        <td><?php echo $data->first_name." ".$data->last_name; ?></td>
                        <td><?php echo $data->email; ?></td>
                        <td><?php echo $data->phone_number; ?></td>
                        <td><?php echo $data->address;?></td>
                    </tr>
                <?php 
                    }
                }
                ?>
            </tbody>

Hope someone can help. Thanks

EDIT: Added photo for clarity