How to check and uncheck checkbox automatically

I'm doing a page where i can display a list of data with checkboxes. then i will automatically check with database and if the data is there, the checkbox will be checked. What i want to do now is, lets say the checkbox is checked automatically, andwhen i unchecked it myself and save, it will update the data in database.

Example of my coding:

<form action="" method="get">
    <input name="_token" type="hidden" value=""/>
    @foreach($var as $v)
    <table style="margin-left:20px;">
         <caption></caption>
         @foreach($name as $n)
         <?php if($n->module_groupname == $v->module_groupname){?>
         <tr><td width="80"><input type="checkbox" name="module_code[]" value=""
         <?php foreach($priv as $p){
         if($p->user_id == $d->id){
             if($p->module_code == $n->module_code){
                 echo 'checked="checked"';
             }
         }
     }?>></td>
     <td width="150"></td>
     <td width="200"></td>
    </tr> <?php } ?>
 @endforeach
</table>
<hr>
@endforeach
<input type="submit" value="select" class="btn btn-s btn-success">
</form>

i've been advised to lookup for PLUS statement oracle but i couldnt find how

via Chebli Mohamed