php include_once _SERVER DOCUMENT_ROOT php config php if isset _SESSIO

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<?php
include_once($_SERVER['DOCUMENT_ROOT']."/php/config.php");
if(!isset($_SESSION['cart']))
$_SESSION['cart']=array();
if(isset($_POST['id']))
{
$goodsid=intval($_POST['id']);
if($goodsid)
{
$obj=new StdClass();
$obj->qty=1;
$obj->attr=array();
if(isset($_POST['dynattr']))
{
$obj->attr=$_POST['dynattr'];
}
$_SESSION['cart'][$goodsid]=$obj;
}
$count=count($_SESSION['cart']);
echo $count;
?>