我有一个带有数组结果的会话:
Array (
[0] => Array (
[code] => 16
[qty] => 1
)
[1] => Array (
[code] => 17
[qty] => 1
)
[2] => Array (
[code] => 20
[qty] => 1
)
)
我想删除特定的一个项目,所以我写了代码:
$t = "a";
foreach ($_SESSION["products"] as $cart_itm) //loop through session array var
{
echo "Cart item code".$cart_itm["code"];
echo "product_code".$product_code."<br/>";
if($cart_itm["code"] === $product_code){ //item does,t exist in the list
$t="b";
unset($_SESSION["products"][$product_code]);
}else{
$t = "c";
}
//create a new product list for cart
}
echo "$t";
print_r($_SESSION["products"])
我得到了一个结果:
Cart item code16 product_code17
Cart item code17 product_code17
Cart item code20 product_code17
cArray (
[0] => Array (
[code] => 16
[qty] => 1
)
[1] => Array (
[code] => 17
[qty] => 1
)
[2] => Array (
[code] => 20
[qty] => 1
)
)
我不明白为什么变量不是 b,因为第二个数组应该返回 true?
编辑:
感谢您的帮助,我已经尝试了解决方案,但仍未设置的会话仍然不起作用
session_start();
$product_code = $_GET["pid"]; //get the product code to remove
echo "before :";
print_r($_SESSION["products"]);
echo "<br/>";
$t="a";
foreach($_SESSION['products'] as $key => $cart_item) {
if($key === $product_code) {
unset($_SESSION["products"][$key]);
$t="b";
}
}
echo "after :";
print_r($_SESSION["products"]);
echo "$t";
但我仍然得到结果:
之前 :数组 ( [16 ] => 数组 ( [数量] => 1 ) [19 ] => 数组 ( [数量] => 1 ) [18 ] =>数组 ( [数量] => 1 ) ) )之后 :数组 ( [16
] => 数组 ( [数量] => 1 ) [19 ] => 数组 ( [数量] => 1 ) [18 ] => 数组 ( [数量] => 1 ) ) a是浏览器缓存的问题吗?
编辑:
我终于想出了解决方案。
$a = "";
foreach ($_SESSION["products"] as $key => $cart_itm) //loop through session array var
{
if($cart_itm["code"] == $product_code) { //item does,t exist in the list
$a = $key;
}
}
$b = (int)$a;
unset($_SESSION["products"][$b]);
如果您无法管理会话的设置方式,这将适合您:
foreach($_SESSION['products'] as $key => $cart_itm) {
if($cart_itm["code"] == $product_code){ //item does,t exist in the list
unset($_SESSION["products"][$key]);
}
}
如果可以修改会话的设置方式
如果我是你,我会按照达贡在评论中所说的去做。如果您有权访问创建会话变量的 PHP,则应像这样存储它:
$_SESSION['products'][PRODUCT_CODE] = array('qty' => 1);
这将导致您拥有这样的数组:
Array (
[product_code] => Array (
[qty] => 1
),
[product_code] => Array (
[qty] => 1
),
[product_code] => Array (
[qty] => 1
)
)
这样,您可以简单地运行如下所示的 foreach 循环:
foreach($_SESSION['products'] as $key => $cart_item) {
if($key === $product_code) {
unset($_SESSION[$key]);
}
}
编辑
正如Ghost所说,这样做会简单得多:
if(isset($_SESSION['products'][$product_code]) unset($_SESSION['products'][$product_code);
或
if(array_key_exists($product_code, $_SESSION['products'])) {
unset($_SESSION['products'][$product_code]);
}
函数参考:array_key_exists()
和isset()
。
首先,变量不b
的原因是因为您将变量设置回else
分支中的c
。
也就是说,即使变量 IS 在某个时候设置为 b
,您的循环也会继续运行(到第三次迭代,$cart_itm["code"]
现在20
),并且计算else
分支,将您的变量设置回 c
。
其次,您取消设置了错误的内容 - $product_code
不是要使用的正确索引。
$t = "a";
foreach ($_SESSION["products"] as $key => $cart_itm) //loop through session array var
{
echo "Cart item code".$cart_itm["code"];
echo "product_code".$product_code."<br/>";
if ($cart_itm["code"] === $product_code) { //item does,t exist in the list
$t = "b";
unset($_SESSION["products"][$key]);
}
//create a new product list for cart
}
echo "$t";
print_r($_SESSION["products"]);
您应该获得:
Cart item code16 product_code17
Cart item code17 product_code17
Cart item code20 product_code17
aArray (
[0] => Array (
[code] => 16
[qty] => 1
)
[2] => Array (
[code] => 20
[qty] => 1
)
)