Как пересчитать количество товаров по своей функции? - Разработки и улучшения

$product_extra_field = array();
foreach($this->product->extra_field as $extra_field){
	$product_extra_field[$extra_field['id']] = $extra_field;
}
$this->product->extra_field = $product_extra_field;

$this->product->extra_field[Тут ID характеристики]['value']

<div class="prod_qty_input">

                    <input type="text" name="quantity" id="quantity" onkeyup="reloadPrices();" class="inputbox" value="<?php print      round((((floor((($this->default_count_product)/$this->product->extra_field[2]['value'])))*$this->product->extra_field[2]['value'])+((round(((($this->default_count_product)-((floor((($this->default_count_product)/$this->product->extra_field[2]['value'])))*$this->product->extra_field[2]['value']))/($this->product->extra_field[2]['value']/$this->product->extra_field[1]['value']))))*($this->product->extra_field[2]['value']/$this->product->extra_field[1]['value']))),3)?>" /><?php print $this->_tmp_qty_unit;?>
                     

<?php

/**

 * @version      4.9.2 22.10.2014

 * @author       MAXXmarketing GmbH

 * @package      Jshopping

 * @copyright    Copyright (C) 2010 webdesigner-profi.de. All rights reserved.

 * @license      GNU/GPL

 */

defined('_JEXEC') or die('Restricted access');



$countprod = count($this->products);






?>

<div class="jshop" id="comjshop">

<form action="<?php print SEFLink('index.php?option=com_jshopping&controller=cart&task=refresh')?>" method="post" name="updateCart">



<?php print $this->_tmp_ext_html_cart_start ?>    



<?php if ($countprod > 0) : ?>

    <table class="jshop cart">

    <tr>

        <th class="jshop_img_description_center" width="20%">

            <?php print _JSHOP_IMAGE ?>

        </th>

        <th class="product_name">

            <?php print _JSHOP_ITEM ?>

        </th>    

        <th class="single_price" width="15%">

            <?php print _JSHOP_SINGLEPRICE ?>

        </th>

        <th class="quantity" width="15%">

            <?php print _JSHOP_NUMBER ?>

        </th>

        <th class="total_price" width="15%">

            <?php print _JSHOP_PRICE_TOTAL ?>

        </th>

        <th class="remove" width="10%">

            <?php print _JSHOP_REMOVE ?>

        </th>

    </tr>

    <?php

    $i = 1;

    foreach ($this->products as $key_id => $prod){

    ?> 

    <tr class="jshop_prod_cart <?php if ($i % 2 == 0) print "even"; else print "odd"?>">

        <td class="jshop_img_description_center">

            <div class="mobile-cart">

                <?php print _JSHOP_IMAGE; ?>

            </div>

            <div class="data">

                <a href="<?php print $prod['href'] ?>">

                    <img src="<?php print $this->image_product_path ?>/<?php

                    if ($prod['thumb_image'])

                        print $prod['thumb_image'];

                    else

                        print $this->no_image;

                    ?>" alt="<?php print htmlspecialchars($prod['product_name']); ?>" class="jshop_img" />

                </a>

            </div>

        </td>

        <td class="product_name">

            <div class="mobile-cart">

                <?php print _JSHOP_ITEM; ?>

            </div>

            <div class="data">

                <a href="<?php print $prod['href'] ?>">

                    <?php print $prod['product_name'] ?>

                </a>

                <?php if ($this->config->show_product_code_in_cart) { ?>

                    <span class="jshop_code_prod">(<?php print $prod['ean'] ?>)</span>

                <?php } ?>

                <?php if ($prod['manufacturer'] != '') { ?>

                    <div class="manufacturer"><?php print _JSHOP_MANUFACTURER ?>: <span><?php print $prod['manufacturer'] ?></span></div>

                <?php } ?>

                <?php print sprintAtributeInCart($prod['attributes_value']); ?>

                <?php print sprintFreeAtributeInCart($prod['free_attributes_value']); ?>

                <?php print sprintFreeExtraFiledsInCart($prod['extra_fields']); ?>

                <?php print $prod['_ext_attribute_html'] ?>

            </div>

        </td> 

        <td class="single_price">

            <div class="mobile-cart">

                <?php print _JSHOP_SINGLEPRICE; ?>

            </div>

            <div class="data">

                <?php print formatprice($prod['price'])?>

                <?php print $prod['_ext_price_html'] ?>

                <?php if ($this->config->show_tax_product_in_cart && $prod['tax'] > 0) { ?>

                    <span class="taxinfo"><?php print productTaxInfo($prod['tax']); ?></span>

                <?php } ?>

                <?php if ($this->config->cart_basic_price_show && $prod['basicprice'] > 0) { ?>

                    <div class="basic_price">

                        <?php print _JSHOP_BASIC_PRICE ?>: 

                        <span><?php print sprintBasicPrice($prod); ?></span>

                    </div>

                <?php } ?>

            </div>

        </td>

        <td class="quantity">

            <div class="mobile-cart">

                <?php print _JSHOP_NUMBER; ?>

            </div>

            <div class="data">

                <input type = "text" name = "quantity[<?php print $key_id ?>]" value = "<?php print $prod['quantity']?>" class = "inputbox" />
                

                <?php print $prod['_qty_unit']; ?>

                <span class = "cart_reload">

                    <img src="<?php print $this->image_path?>images/reload.png" title="<?php print _JSHOP_UPDATE_CART ?>" alt = "<?php print _JSHOP_UPDATE_CART ?>" onclick="document.updateCart.submit();" />

                </span>

            </div>

        </td>

        <td class="total_price">

            <div class="mobile-cart">

                <?php print _JSHOP_PRICE_TOTAL; ?>

            </div>

            <div class="data">

                <?php print formatprice($prod['price'] * $prod['quantity'] ); ?>

                <?php print $prod['_ext_price_total_html'] ?>

                <?php if ($this->config->show_tax_product_in_cart && $prod['tax'] > 0) { ?>

                    <span class="taxinfo"><?php print productTaxInfo($prod['tax']); ?></span>

                <?php } ?>

            </div>

        </td>

        <td class="remove">

            <div class="mobile-cart">

                <?php print _JSHOP_REMOVE; ?>

            </div>

            <div class="data">

                <a class="button-img" href="<?php print $prod['href_delete']?>" onclick="return confirm('<?php print _JSHOP_CONFIRM_REMOVE?>')">

                    <img src = "<?php print $this->image_path ?>images/remove.png" alt = "<?php print _JSHOP_DELETE?>" title = "<?php print _JSHOP_DELETE?>" />

                </a>

            </div>

        </td>

    </tr>

    <?php

    $i++;

    }

    ?>

    </table>



    <?php if ($this->config->show_weight_order) : ?>

        <div class = "weightorder">

            <?php print _JSHOP_WEIGHT_PRODUCTS?>: <span><?php print formatweight($this->weight);?></span>

        </div>

    <?php endif; ?>

      

    <?php if ($this->config->summ_null_shipping > 0) : ?>

        <div class = "shippingfree">

            <?php printf(_JSHOP_FROM_PRICE_SHIPPING_FREE, formatprice($this->config->summ_null_shipping, null, 1));?>

        </div>

    <?php endif; ?>

      

    <div class = "cartdescr"><?php print $this->cartdescr; ?></div>



    <table class="jshop jshop_subtotal">

        <?php if (!$this->hide_subtotal){?>

            <tr class="subtotal">

                <td class="name">

                    <?php print _JSHOP_SUBTOTAL ?>

                </td>

                <td class="value">

                    <?php print formatprice($this->summ);?><?php print $this->_tmp_ext_subtotal?>

                </td>

            </tr>

        <?php } ?>

        

        <?php print $this->_tmp_html_after_subtotal?>

        

        <?php if ($this->discount > 0){ ?>

            <tr class="discount">

                <td class="name">

                    <?php print _JSHOP_RABATT_VALUE ?>

                </td>

                <td class="value">

                    <?php print formatprice(-$this->discount);?><?php print $this->_tmp_ext_discount?>

                </td>

            </tr>

        <?php } ?>

        <?php if (!$this->config->hide_tax){?>

            <?php foreach($this->tax_list as $percent=>$value){ ?>

                <tr class="tax">

                    <td class = "name">

                        <?php print displayTotalCartTaxName();?>

                        <?php if ($this->show_percent_tax) print formattax($percent)."%"?>

                    </td>

                    <td class = "value">

                        <?php print formatprice($value);?><?php print $this->_tmp_ext_tax[$percent]?>

                    </td>

                </tr>

            <?php } ?>

        <?php } ?>

        

        <tr class="total">

            <td class = "name">

                <?php print _JSHOP_PRICE_TOTAL ?>

            </td>

            <td class = "value">

                <?php print formatprice($this->fullsumm)?><?php print $this->_tmp_ext_total?>

            </td>

        </tr>

        

        <?php print $this->_tmp_html_after_total?>

        

        <?php if ($this->config->show_plus_shipping_in_product){?>  

            <tr class="plusshipping">

                <td colspan="2" align="right">    

                    <span class="plusshippinginfo"><?php print sprintf(_JSHOP_PLUS_SHIPPING, $this->shippinginfo);?></span>  

                </td>

            </tr>

        <?php }?>

        

        <?php if ($this->free_discount > 0){?>  

            <tr class="free_discount">

                <td colspan="2" align="right">    

                    <span class="free_discount"><?php print _JSHOP_FREE_DISCOUNT;?>: <?php print formatprice($this->free_discount); ?></span>  

                </td>

            </tr>

        <?php }?>

        

    </table>

<?php else : ?>

    <div class="cart_empty_text"><?php print _JSHOP_CART_EMPTY?></div>

<?php endif; ?>



<?php print $this->_tmp_html_before_buttons?>

<div class = "jshop cart_buttons">

    <div id = "checkout">

        <div class = "pull-left td_1">

            <a href = "<?php print $this->href_shop ?>" class = "btn">

                <img src = "<?php print $this->image_path ?>/images/arrow_left.gif" alt="<?php print _JSHOP_BACK_TO_SHOP ?>" />

                <?php print _JSHOP_BACK_TO_SHOP ?>

            </a>

        </div>

        <div class = "pull-right td_2">

        <?php if ($countprod>0) : ?>

            <a href = "<?php print $this->href_checkout ?>" class = "btn">

                <?php print _JSHOP_CHECKOUT ?>

                <img src = "<?php print $this->image_path ?>/images/arrow_right.gif" alt="<?php print _JSHOP_CHECKOUT ?>" />

            </a>

        <?php endif; ?>

        </div>

        <div class = "clearfix"></div>

    </div>

</div>



<?php print $this->_tmp_html_after_buttons?>



</form>



<?php print $this->_tmp_ext_html_before_discount?>



<?php if ($this->use_rabatt && $countprod>0) : ?>

    <div class="cart_block_discount">

        <form name="rabatt" method="post" action="<?php print SEFLink('index.php?option=com_jshopping&controller=cart&task=discountsave'); ?>">

            <div class = "row-fluid jshop">

                <div class = "span12">

                    <div class="name"><?php print _JSHOP_RABATT ?></div>

                    <input type = "text" class = "inputbox" name = "rabatt" value = "" />

                    <input type = "submit" class = "button btn" value = "<?php print _JSHOP_RABATT_ACTIVE ?>" />

                </div>

            </div>

        </form>

    </div>

<?php endif; ?>

            

</div>

<input type = "text" name = "quantity[<?php print $key_id ?>]" value = "<?php print $prod['quantity']?>" class = "inputbox" />

<?php print formatprice($prod['price'] * $prod['quantity'] ); ?>