如何找到在多维$ _SESSION数组中的特定值？ [英] How to find a specific value in multidimensional $_SESSION array?
问题描述
我使用的是 $ _ SESSION 数组来存放物品描述，数量和价格放在购物车中的物品。这一切工作的花花公子，这里的code的开始部分：
$数量= 1;//从店铺页面中添加第一个项目
如果（使用isset（$ _ POST ['add_item']）及及（使用isset（$ _ SESSION ['购物车']））！）{
$ _SESSION ['购物车'] =阵列（）;
$ _SESSION ['购物车'] [$ _ POST ['PRODUCT_DESCRIPTION'] =阵列（'量'= GT; $数量，'价格'=＆GT; $ _ POST ['PRODUCT_PRICE']）;
标题（位置：http://website.com/cart.php）;
}
这将加载相应的信息在 $ _ SESSION ['购物车'] 阵列，当我的foreach 循环播放在车页面，我得到我的购物车的确切内容。根据需要所有这一切工作的。
所以现在我想要做的是搜索 $ _ SESSION ['购物车'] 数组来确定特定产品在 $ _SESSION ['购物车'] 阵列，如iPhone外壳 - 黑色。
我已经尝试了各种形式的的回声$ _SESSION ['购物车'] ['PRODUCT_DESCRIPTION'] 键，什么也没得到。当我的print_r 数组，我得到这样的：
阵列
（
[iPhone案例 - 黑色] =＆GT;排列
（
[数量] =＆GT; 1
[价格] =＆GT; 9.49
））
这是正确的。执行的var_dump 产生预期的结果是：
阵列（1）{
[iPhone案例 - 黑色] =＆GT;
阵列（2）{
[数量] =＆GT;
INT（1）
[价格] =＆GT;
串（4）9.49
}
}
当然，如果有更好的方法来构建数组，我接受它。
是 $ _ SESSION ['购物车'] 数组和服务于适当的$ C $ - 所有我想要做的是找出是否黑色iPhone案基于C的结果。
我曾尝试如果（in_array（'iPhone外壳 - 黑'，$ _SESSION ['购物车']））这将产生什么，当我展开到如果（in_array（'iPhone外壳 - 黑'，$ _SESSION ['购物车'] [0]））或 ... [1] 或 ... ['PRODUCT_DESCRIPTION'] 我收到错误消息：
警告：in_array（）预计参数2是阵列，在...空给出
我在想什么，将只是让我检查 $ _ SESSION ['购物车'] 数组找到价值，iPhone外壳 - 黑？是我唯一的选择一个的foreach 循环？
许多诚挚的感谢提前！
更新
code张贴根据来自@rmmoul要求：
//从店铺页面中添加第一个项目
如果（使用isset（$ _ POST ['add_item']）及及（使用isset（$ _ SESSION ['购物车']））！）{
$ _SESSION ['购物车'] [] =阵列（'PRODUCT_DESCRIPTION'=＆GT; $ _ POST ['PRODUCT_DESCRIPTION']，'量'=＆GT; $数量，'价格'=＆GT; $ _ POST ['PRODUCT_PRICE']）;
标题（位置：http://website.com/cart.php）;
}
返回此通过的print_r ：
阵列
（
[0] =＆GT;排列
（
[PRODUCT_DESCRIPTION] =＆GT; iPhone保护壳 - 黑色
[数量] =＆GT; 1
[价格] =＆GT; 9.49
） [1] =＆GT;排列
（
[PRODUCT_DESCRIPTION] =＆GT; iPhone保护壳 - 黑色
[数量] =＆GT; 1
[价格] =＆GT; 9.49
））
由于您使用的是 $ _ POST ['PRODUCT_DESCRIPTION'] 为重点分配的值将成为关键，即iPhone外壳 - 黑
试试这个：
如果（使用isset（$ _ SESSION ['购物车'] ['iPhone外壳 - 黑色']））{的foreach（$ _ SESSION ['购物车'] ['iPhone外壳 - 黑']为$关键=＆GT; $值）{回声$键＆LT。$价值。; BR＆gt;中;}
I am using a $_SESSION array to store item description, quantity and price for items placed in a shopping cart. This all works dandy, here's the beginning portion of the code:
$quantity = 1;
// add first item from shop page
if(isset($_POST['add_item']) && (!isset($_SESSION['cart']))) {
$_SESSION['cart'] = array();
$_SESSION['cart'][$_POST['product_description']] = array('quantity' => $quantity, 'price' => $_POST['product_price']);
header("Location: http://website.com/cart.php");
}
This loads the $_SESSION['cart'] array with the appropriate information and when I foreach loop it in the cart page, I get the exact contents of my cart. All of this works as desired.
So now what I want to do is search the $_SESSION['cart'] array to determine if a specific item is in the $_SESSION['cart'] array, such as "iPhone case - Black".
I have tried various forms of echo $_SESSION['cart']['product_description'] and get nothing. When I print_r the array, I get this:
Array
(
[iPhone case - Black] => Array
(
[quantity] => 1
[price] => 9.49
)
)
Which is correct. Performing a var_dump yields the expected result:
array(1) {
["iPhone case - Black"]=>
array(2) {
["quantity"]=>
int(1)
["price"]=>
string(4) "9.49"
}
}
Certainly, if there is a better way to construct the array, I'm open to it.
All I want to do is find out if "iPhone case - Black" is in the $_SESSION['cart'] array and serve up the appropriate code based on the result.
I have tried if (in_array('iPhone case - Black', $_SESSION['cart'])) which yields nothing, and when I expand that to if (in_array('iPhone case - Black', $_SESSION['cart'][0])) or ...[1] or ...['product_description'] I receive the error:
Warning: in_array() expects parameter 2 to be array, null given in...
What am I missing that would simply let me check the $_SESSION['cart'] array to find the value, "iPhone case - Black"? Is my only option a foreach loop?
Many sincere thanks in advance!
UPDATE Code posting as per request from @rmmoul:
// add first item from shop page
if(isset($_POST['add_item']) && (!isset($_SESSION['cart']))) {
$_SESSION['cart'][] = array('product_description'=> $_POST['product_description'], 'quantity' => $quantity, 'price' => $_POST['product_price']);
header("Location: http://website.com/cart.php");
}
Returns this through a print_r:
Array
(
[0] => Array
(
[product_description] => iPhone case - Black
[quantity] => 1
[price] => 9.49
)
[1] => Array
(
[product_description] => iPhone case - Black
[quantity] => 1
[price] => 9.49
)
)
since you are using $_POST['product_description'] as key the assigned value will become key i.e. 'iPhone case - Black'.
try this:
if (isset($_SESSION['cart']['iPhone case - Black'])){
foreach($_SESSION['cart']['iPhone case - Black'] as $key=>$value){
echo $key." ".$value."<br>";
}
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