Nested foreach loop duplicate issue

[Linu]

I need to use nested foreach for dependent checkboxes.

<input class="bookmain" type="checkbox" id="bus<?php echo $row_bus_details['busid'];?>" name="all[]" onchange="return OptionsSelected(this)" value="<?php echo $row_bus_details['busid'];?>" >

<?php
                                       $book_side_result = mysqli_query($db,"select * from advt_sides");
                                       while($book_side_row=mysqli_fetch_array($book_side_result))
                                       {
                                       ?>
                                       <input type="checkbox" name="bookingside[]" value="<?php echo $book_side_row['advt_side_id']; ?>" id="<?php echo $book_side_row['advt_side']; ?><?php echo $row_bus_details['busid'];?>" name="<?php echo $book_side_row['advt_side']; ?>"> <?php echo $book_side_row['advt_side']; ?><br/>
                                      <?php } ?>



$i = 0;
           $busid = isset($_POST['all']) ? $_POST['all'] : array();
           foreach ((array)$busid as $item) {

             if(!empty($_POST['bookingside'])) {
               $j = 0;
            foreach($_POST['bookingside'] as $side) {
                $sql_book_side=mysqli_query($db,"INSERT INTO `advt_book_side`(bus_id,sides_id) VALUES ('$item','$side')");
                $j++;
            }
              $i++;
        }



}