Question

我正在做以下但是它不起作用。无论添加多少

，它在数组中只有1个项目

有人可以告诉我我做错了吗

session_start();

$pid = mysql_real_escape_string(trim($_GET["pid"]));
$price = mysql_real_escape_string(trim($_GET["price"]));
$quantity = mysql_real_escape_string(trim($_GET["quantity"]));

if (!isset($_SESSION['cart'])) {
    $_SESSION['cart'] = array();

    $_SESSION['cart']['pid'] = $pid;
    $_SESSION['cart']['total_price'] = $price;
    $_SESSION['cart']['total_items'] = $quantity;

}else{
    $_SESSION['cart']['pid'] = $pid;
    $_SESSION['total_price'] += $price;
    $_SESSION['total_items']  += $quantity;
}

Answer 1

看起来您只是重置数组中的值。每次设置$ _SESSION ['cart'] ['pid']时，你都会重写最后一个值。但是，你的total_price和total_quantity可能正确递增吗？

请改用$_SESSION['cart']['pid'][] = $pid;。您需要一个'pid'数组，以便您可以拥有多个项目。 []运算符告诉php将值视为数组，并将新值推送到数组的末尾。

编辑：您在if下的初始化应如下所示，以便您的['pid']是一个pid数组：

$_SESSION['cart'] = array();
$_SESSION['cart']['pid'] = array(); //this might be redundant...but I always initialize my variables
$_SESSION['cart']['pid'][] = $pid;
$_SESSION['cart']['total_price'] = $price;
$_SESSION['cart']['total_items'] = $quantity;

在else下你会得到：

$_SESSION['cart']['pid'][] = $pid;
$_SESSION['cart']['total_price'] += $price;
$_SESSION['cart']['total_items'] += $quantity;

注意：您忘记了[{1}}下的total_price和total_items上的['cart']，如其他答案所述。

Answer 2

看起来你忘了将['cart']添加到底部的两个$ _SESSION setter：

$_SESSION['total_price'] += $price;
$_SESSION['total_items']  += $quantity;

更改为

$_SESSION['cart']['total_price'] += $price;
$_SESSION['cart']['total_items']  += $quantity;

Answer 3

$_SESSION['cart']['pid'] = $pid; 
$_SESSION['total_price'] += $price; 
$_SESSION['total_items']  += $quantity;

你在其他声明中忘了['cart'] ..应该是：

$_SESSION['cart']['pid'] = $pid; 
$_SESSION['cart']['total_price'] += $price; 
$_SESSION['cart']['total_items']  += $quantity;

Answer 4

你在else语句的最后一个会话变量中忘了['cart']。

请参阅this以获取php中的数组引用函数列表。

如何在PHP中添加数组？

4 个答案: