disable checkbox which is not selected

I have a checkbox in my form with some of them are checked. when i select view option from view/edit it only displays the checkbox which is already selected as checked and all others as disabled.. my code is below

Applied To

                    <div class="span12 checkbox-grid" name="class[]" >
                         <?php if ($view=="View") {?>
                         <?php  foreach ($class as $class) : ?>
                        <li>
                            <input  type="checkbox" name="class[]" value="<?php echo $class->class_id; ?>"<?php foreach ($class1 as $row1){ echo $class->class_id == $row1->class_id  ? 'checked="checked" ' :'disabled';} ?> >
                       <label style="display:inline"><?php cho $class->class; ?></label>
                       </li>

                        <?php endforeach;}} else{ ?> 

                         <?php  foreach ($class as $class) : ?>
                        <li>
                            <input  type="checkbox" name="class[]" value="<?php echo $class->class_id; ?>"<?php foreach ($class1 as $row1){ echo $class->class_id == $row1->class_id  ? 'checked="checked" ' :'';} ?> >
                       <label style="display:inline"><?php echo $class->class; ?></label>
                       </li>

                        <?php endforeach; ?> 

                    </div>  
                    <div class="span10 checkbox-grid">
                        <input type='checkbox' name='checkall' onclick='checkedAll(form);'>
                       <label style="display:inline">All</label>
                    </div>
                    </div> 

in controller

$data['class'] = $this->model['registration']->class_list(); $data['class1'] = $this->model['registration']->class_list1($this->url_slice(3, 0));