Php 从多维数组值创建字符串

我有这样一个代码：

$user = JFactory::getUser();
$user_id= $user->get('id');

$db = JFactory::getDbo();
$db->setQuery("SELECT virtuemart_user_id, order_number, order_total, created_on FROM `kunkp_virtuemart_orders` WHERE `virtuemart_user_id`='$user_id' ");

$row = $db->loadRowList();

print_r($row);`

The output of the result is like this:


Array
(
    [0] => Array
        (
            [0] => 42
            [1] => 10e803
            [2] => 122.05487
            [3] => 2013-06-10 20:34:39
        )

    [1] => Array
    (
        [0] => 42
        [1] => 901e04
        [2] => 349.78500
        [3] => 2013-06-11 07:28:19
    )

)

但它不起作用。任何人都可以帮我。

更换这个

 `foreach($row as $d){

用这个

$order_number = "";   
 foreach($row as $val){
    $order_number.= ",".$val[1];
 }
echo $order_number;

---

$order_number.=$d[0][1]；-尝试使用此选项，您必须首先初始化$order\U编号。下$order_number=“”；在foreach之前。您确定在输出$row时这是您的结构吗……您能在打印r之前回显“”吗？这样我们可以比在一行上更直观地看到它吗

$order_number = "";   
 foreach($row as $val){
    $order_number.= ",".$val[1];
 }
echo $order_number;