Форум

{ 'price_id': 'price_id','b'}

{ 'price_id': 'price_id'}

 success: function(b)
            { alert(b) } 

<script type="text/javascript">
$('.red').click(function()
        {
            var price_id = $(this).parent().find('.price_id').text();
            $.ajax({url:'/index.php',
                data: ({price_id:price_id}),
                                success: function(b)
                                { $('.red').html(b); }
            });
            return false;
        });
</script>

<?
$price_id = $_GET['price_id'];
$data = !empty($_COOKIE['products']) ? unserialize($_COOKIE['products']) : array();?>
обработка "$data"
$b="text";
setcookie('products', serialize($data), time() + 172800, "/", '', false, true);

<?
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");
$APPLICATION->SetTitle("test title");

$arSelect = Array("ID", "NAME", "DATE_ACTIVE_FROM","IBLOCK_SECTION_ID");
$arFilter = Array("IBLOCK_ID"=>20, "ACTIVE_DATE"=>"Y", "ACTIVE"=>"Y");
$res = CIBlockElement::GetList(Array(), $arFilter, false, Array("nPageSize"=>50),$arSelect);

$id = $_REQUEST["id"];
$ret = array();
for($i=0;$i<10;$i++){
  $value = $id . "-" . $i;
  $ret[] = array(
    "id" => $value,
    "text" => $value.' иванов ',
    "value" => $value,
    "showcheck" => true,
    "complete" => false,
    "isexpand" => false,
    "checkstate" => 0,
    "hasChildren" => true
  );
}

header('Content-type:text/javascript;charset=UTF-8');
echo json_encode($ret); 
?>