<?php
class mymoduledisplayModuleFrontController extends ModuleFrontController
{
  public function initContent()
  {
    parent::initContent();
    $this->setTemplate('display.tpl');
    
    
     $this->context->smarty->assign(
     $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
            SELECT p.id_product, p.price
            FROM `'._DB_PREFIX_.'product` p
            WHERE (p.`id_product` > 155)
            ORDER BY `id_product` '));    
        $returns = array();
    
        foreach ($result as &$row)
        {
        $return = $this->context->smarty->assign(
         array(
         'id' => $row['id_product'],
         'price' => $row['price'],
        )
         );
        }
        
        return $returns;
        return $this->display(__FILE__, 'display.tpl');
  }
}        

{include file="$tpl_dir./errors.tpl"}
{foreach from=$returns item=return name=fast}
  <hr />
  {foreach from=$return item=price}
  {$id} {$price} <br />
  {/foreach}
{/foreach}

$this->context->smarty->assign('returns',$returns));

<?php
class mymoduledisplayModuleFrontController extends ModuleFrontController
{
  public function initContent()
  {
    parent::initContent();
      $this->setTemplate('display.tpl');
    
    
    
     $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS('
            SELECT p.id_product, p.price
            FROM `'._DB_PREFIX_.'product` p
            WHERE (p.`id_product` > 155)
            ORDER BY `id_product` ');    
        $return = array();
    
        foreach ($result as &$row)
        {
        $return[$row['id_product']] =
         array(
         'id' => $row['id_product'],
         'price' => $row['price'],
        );
        }
           
        $this->context->smarty->assign('return',$return);
        
  }
    
      
}

{foreach from=$return item=re}
       {$re.id} : {$re.price} <br />
{/foreach}