Save ArrayIterator in MySQL

I'm having trouble saving a list of items in ArrayInterator , where I need to save this data in the table when I click a save button.

Array code:

<?php
    ...
    $p = new ArrayIterator($_SESSION['PEDIDO']);

    while ($p->valid()):

         //$p->key(); Utilizado para pegar os ids.
         //$p->current(); Pega a quantidade de produtos por ids.

         $c = new Carrinho;
         $c->setId($p->key());
         $pedido = $c->listarPedidos();
?>
    <tr>
        <td><?php echo $p->key(); ?></td>
        <td><?php echo $pedido->NMPRODRUTO; ?></td>
        <td>R$ <?php echo number_format($pedido->VLVENDA,2,",","."); ?></td>
        <td align="center"><input type="text" id="qtde" value="<?php echo $p->current(); ?>" data-id="<?php echo $p->key(); ?>" data-preco="<?php echo $pedido->VLVENDA; ?>"/></td>
        <td align="center" id="subtotal">R$ <?php echo number_format(($pedido->VLVENDA*$p->current()),2,",",".") ?></td>
        <td align="center"><a href="?delete=ok&id=<?php echo $p->key(); ?>"><img src="img/deletar.png" id="excluir" /></a></td>
    </tr>

<?php
   $p->next();
endwhile;?>