Getting the right Checkbox Value in Array

I have a form where i collect data from checkboxes. Here is my form

<div class="col-md-6">
                        <textarea name='description[]' placeholder="" rows='6' id='description' class='form-control '  
                     required  ></textarea> 
                     <div class="col-md-12">
                            <?php $meal = explode(",",$day->meal); ?>
                 <label class='checked checkbox-inline'>   
                <input type='checkbox' name='meal[]' value ='B'   class='' 
                @if(in_array('B',$meal))checked @endif 
                 />  </label> 
                 <label class='checked checkbox-inline'>   
                <input type='checkbox' name='meal[]' value ='L'   class='' 
                @if(in_array('L',$meal))checked @endif 
                 />  </label> 
                 <label class='checked checkbox-inline'>   
                <input type='checkbox' name='meal[]' value ='D'   class='' 
                @if(in_array('D',$meal))checked @endif 
                 />  </label>  
                                     </div> 

                                  </div> 

And this is my controller

$day = $_POST['day'] ;
            for($i=0; $i < count($day); $i++)
            {
                $dataDays = array(
                    'day'             => $_POST['day'][$i],
                    'title'           => $_POST['title'][$i],
                    'meal'            => implode(',', (array)$_POST['meal'] ),
                    'description'     => $_POST['description'][$i],
                    'cityID'          => $_POST['cityID'][$i],
                    'tourID'          => $id
                );
                \DB::table('tour_detail')->insert($dataDays);
            }

I get all the data right except meal. What am i missing with implode? I tried one without array as implode(',', $_POST['meal'] ), this didnt help. I tried implode(',', $_POST['meal'][$i] ) but i got an error. Can you please tell me how can i get the right data from checkboxes.

thanks