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社区首页 >问答首页 >Unset问题(PHP)

问Unset问题(PHP)
EN

Stack Overflow用户
提问于 2020-11-12 09:10:44
回答 5查看 250关注 0票数 3

我试图从会话数组中取消一个项，它取消一次，然后再带回来。for exg :-

如果单击以删除itemId = 5，则从会话数组中删除，然后单击以删除itemId = 6，则会看到旧的itemId =5再次出现在数组中。

/***从购物车中删除项目*/

代码语言：javascript
复制
       public function deleteCartItem($id, $customerId, $cartId, $wishlistFlag=false) // Param: ProductID, CustomerID, CartID, WishlistFlag
        {
            $conn = $_SESSION['conn'];
            $itemId = false;
            $chk = array();
           
                    $sql = "DELETE FROM cart_items WHERE product_id=? AND cart_id=?";
                    $stmt = mysqli_prepare($conn, $sql);//$result = $conn->query($sql);
                    $stmt->bind_param('ii', $item['id'],$cartId);
                    $stmt->execute();
                    $itemId = $i;
                    echo $itemId; 
                    $chk[] = $_SESSION['cart'];
                    echo'</br>'; 
                    print_r($chk);
                }
            }
            if (isset($_SESSION['cart'][$itemId])){
                unset($_SESSION['cart'][$itemId]);
       }    
} 





<?php

    $_SESSION['cart'] = array (
  0 => 
  array (
    'id' => 6154353459,
    'name' => 'pro one Night Out Mesh Tee',
    'display_brand' => 'Widow',
    'qty' => 1,
    'price' => '28.0000',
    'special_price' => 0,
    'rule_price' => '',
    'attributes' => 
    array (
      0 => 'BLACK',
      1 => 'XX-Large',
    ),
    'option80' => 18,
    'option125' => 3457,
    'child_product_id' => 61535897,
    'giftcard' => '',
    'whole_preorder' => 0,
    'preorder_shipping_date' => NULL,
    'available_qty' => 5,
    'isRefundable' => true,
    'max_sale_qty' => false,
    'isFree' => 0,
    'segment' => 
    array (
      'magento_product_id' => '65315459',
      'product_id' => 'P19335935',
      'quantity' => 1,
      'name' => 'pro one Night Out Mesh Tee',
      'brand' => 'Widow',
      'price' => 28.0,
      'special_price' => NULL,
      'regular_price' => 28.0,
      'size_type' => 'Regular',
      'manufacturer' => 'Widow',
      'trend' => 'WID goodie Hour 2020',
      'microcategory' => 'Mesh Shirt',
      'doll_category' => NULL,
      'stock_quantity' => 10,
      'sku' => 'S493660',
      'child_stock_quantity' => 1,
      'size' => 'XX-Large',
      'swatch' => 'BLACK',
    ),
  ),
  5 => 
  array (
    'id' => 615345465,
    'name' => 'pro one Night Out Mesh Leggings',
    'display_brand' => 'Widow',
    'qty' => 1,
    'price' => '30.0000',
    'special_price' => 0,
    'rule_price' => '',
    'attributes' => 
    array (
      0 => 'BLACK',
      1 => 'Medium',
    ),
    'option80' => 18,
    'option125' => 3454,
    'child_product_id' => 6315890,
    'giftcard' => '',
    'whole_preorder' => '',
    'preorder_shipping_date' => NULL,
    'available_qty' => 37,
    'isRefundable' => true,
    'max_sale_qty' => false,
    'isFree' => 0,
    'segment' => 
    array (
      'magento_product_id' => '64334515465',
      'product_id' => 'P193936',
      'quantity' => 1,
      'name' => 'pro one Night Out Mesh Leggings',
      'brand' => 'Widow',
      'price' => 30.0,
      'special_price' => NULL,
      'regular_price' => 30.0,
      'size_type' => 'Regular',
      'manufacturer' => 'Widow',
      'trend' => 'WID goodie Hour 2020',
      'microcategory' => 'Printed Leggings',
      'doll_category' => NULL,
      'stock_quantity' => 10,
      'sku' => 'S493664',
      'child_stock_quantity' => 10,
      'size' => 'Medium',
      'swatch' => 'BLACK',
    ),
  ),
  2 => 
  array (
    'id' => 615445348,
    'name' => 'pro two My Lashes Sunglasses',
    'display_brand' => '',
    'qty' => 1,
    'price' => '15.0000',
    'special_price' => 0,
    'rule_price' => '',
    'attributes' => 
    array (
      0 => 'BLACK',
      1 => 'ONE SIZE',
    ),
    'option80' => 18,
    'option125' => 6212,
    'child_product_id' => 6154345358,
    'giftcard' => '',
    'whole_preorder' => '',
    'preorder_shipping_date' => NULL,
    'available_qty' => 295,
    'isRefundable' => true,
    'max_sale_qty' => false,
    'isFree' => 0,
    'segment' => 
    array (
      'magento_product_id' => '6153453448',
      'product_id' => 'P19645642180',
      'quantity' => 1,
      'name' => 'pro two My Lashes Sunglasses',
      'brand' => '',
      'price' => 15.0,
      'special_price' => NULL,
      'regular_price' => 15.0,
      'size_type' => 'Regular',
      'manufacturer' => 'CIEL',
      'trend' => 'WID goodie Hour 2020',
      'microcategory' => 'Cat Eye Sunglasses',
      'category' => 'Accessories,Sunglasses,Cat Eye Sunglasses',
      'special_category' => 'What\'s New,Char Test Category,Widow',
      'doll_category' => NULL,
      'stock_quantity' => 10,
      'sku' => 'S486477',
      'child_stock_quantity' => 10,
      'size' => 'ONE SIZE',
      'swatch' => 'BLACK',
    ),
  ),
  3 => 
  array (
    'id' => 61465645461,
    'name' => 'pro one Night Out goodie Dress',
    'display_brand' => 'Widow',
    'qty' => 1,
    'price' => '45.0000',
    'special_price' => 0,
    'rule_price' => '',
    'attributes' => 
    array (
      0 => 'BLACK',
      1 => 'X-Large',
    ),
    'option80' => 18,
    'option125' => 3456,
    'giftcard' => '',
    'whole_preorder' => '',
    'preorder_shipping_date' => NULL,
    'available_qty' => 12,
    'isRefundable' => true,
    'max_sale_qty' => false,
    'isFree' => 0,
    'segment' => 
    array (
      'magento_product_id' => '616465461',
      'product_id' => 'P1935446934',
      'quantity' => 1,
      'name' => 'pro one Night Out goodie Dress',
      'brand' => 'Widow',
      'price' => 45.0,
      'special_price' => NULL,
      'regular_price' => 45.0,
      'size_type' => 'Regular',
      'manufacturer' => 'Widow',
      'trend' => 'WID goodie Hour 2020',
      'microcategory' => 'goodie Dresses',
      'category' => 'Clothing,Dresses,Mini,goodie Dresses',
      'special_category' => 'Brandsgoodie,Char Test Category,Widow,Widow',
      'doll_category' => NULL,
      'stock_quantity' => 10,
      'sku' => 'S493652',
      'child_stock_quantity' => 10,
      'size' => 'X-Large',
      'swatch' => 'BLACK',
    ),
  ),
  4 => 
  array (
    'id' => 6154566225,
    'name' => 'Feelings Maxi Dress',
    'display_brand' => 'Widow',
    'qty' => 1,
    'price' => '58.0000',
    'special_price' => 0,
    'rule_price' => '',
    'attributes' => 
    array (
      0 => 'BLACK',
      1 => 'Large',
    ),
    'option80' => 18,
    'option125' => 3455,
    'child_product_id' => 61456455677,
    'giftcard' => '',
    'whole_preorder' => '',
    'preorder_shipping_date' => NULL,
    'available_qty' => 30,
    'isRefundable' => true,
    'max_sale_qty' => false,
    'isFree' => 0,
    'segment' => 
    array (
      'magento_product_id' => '614565225',
      'product_id' => 'P1945652050',
      'quantity' => 1,
      'name' => 'Phantom Feelings Maxi Dress',
      'brand' => 'Widow',
      'price' => 58.0,
      'special_price' => NULL,
      'regular_price' => 58.0,
      'size_type' => 'Regular',
      'manufacturer' => 'Widow',
      'trend' => 'WID goodie Hour 2020',
      'microcategory' => 'Maxi Dresses',
      'category' => 'Dresses,Midi & Maxi,Maxi Dresses',
      'special_category' => 'Brandsgoodie,Char Test Category,Widow,Widow',
      'doll_category' => NULL,
      'stock_quantity' => 10,
      'sku' => 'S485794',
      'child_stock_quantity' => 10,
      'size' => 'Large',
      'swatch' => 'BLACK',
    ),
  )
  );

$itemId = 5; // comes dybamically;
   if (   isset($_SESSION['cart'][$itemId])) {
            unset($_SESSION['cart'][$itemId]);
    }
?>

我不明白，有什么想法吗？

您还可以查看沙箱- http://sandbox.onlinephpfunctions.com/code/6bab394d1da39a301ce82b974022da7b7efaface。

请参阅这里的全部代码- PHP SESSION UPDATE ISSUE

谢谢你

php
session
EN

回答 5

Stack Overflow用户

发布于 2020-11-17 10:25:54

您可以很好地重新读取会话数据，这样您所做的删除就会被覆盖。

代码语言：javascript
复制
<?php
$cart = $_SESSION['cart'];
unset($cart[5]);
echo 'deletion confirmed';

//later in execution..
//accidental re-read of cart from session-variable.
//BAD CODE STARTS HERE
$cart = $_SESSION['cart']; //error since you're re-reading cart from session.
//BAD CODE END
//calc totals in basket or something..
$totals = 0;
foreach($cart as $item) {
  $totals = $totals + $item['qty'] * $item['price'];
}

//somewhere in the script, the session variable is updated.
$_SESSION['cart'] = $cart;

很好地知道作为缺省值传递大多数变量，这意味着

$cart =$_SESSION‘’cart‘；

将$_SESSION‘$cart’的内容复制到$cart中。

对$cart所做的任何更改都将在$_SESSION‘’cart‘中自动更新而不是。

如果您不想要一个副本而是一个引用，您可以使用：

代码语言：javascript
复制
$cart = &$_SESSION['cart'];

而且您不需要将$cart保存到$_SESSION中。

(只需确保在进行引用时初始化$_SESSION‘’cart‘)

**和**

会话变量往往会变得一团糟。在应用程序中使用getter和setter。

票数 2
EN

Stack Overflow用户

发布于 2020-11-12 09:53:20

最好的方法是在取消设置之后，从会话中获取更新的数组并再次声明它。

代码语言：javascript
复制
$cart_array = array (
    0 => 
    array (
        'id' => 6154353459,
        'name' => 'pro one Night Out Mesh Tee',
        'display_brand' => 'Widow',
        'qty' => 1,
        'price' => '28.0000',
        'special_price' => 0,
        'rule_price' => '',
        'attributes' => 
        array (
        0 => 'BLACK',
        1 => 'XX-Large',
        ),
        'option80' => 18,
        'option125' => 3457,
        'child_product_id' => 61535897,
        'giftcard' => '',
        'whole_preorder' => 0,
        'preorder_shipping_date' => NULL,
        'available_qty' => 5,
        'isRefundable' => true,
        'max_sale_qty' => false,
        'isFree' => 0,
        'segment' => 
        array (
        'magento_product_id' => '65315459',
        'product_id' => 'P19335935',
        'quantity' => 1,
        'name' => 'pro one Night Out Mesh Tee',
        'brand' => 'Widow',
        'price' => 28.0,
        'special_price' => NULL,
        'regular_price' => 28.0,
        'size_type' => 'Regular',
        'manufacturer' => 'Widow',
        'trend' => 'WID goodie Hour 2020',
        'microcategory' => 'Mesh Shirt',
        'doll_category' => NULL,
        'stock_quantity' => 10,
        'sku' => 'S493660',
        'child_stock_quantity' => 1,
        'size' => 'XX-Large',
        'swatch' => 'BLACK',
        ),
    ),
    5 => 
    array (
        'id' => 615345465,
        'name' => 'pro one Night Out Mesh Leggings',
        'display_brand' => 'Widow',
        'qty' => 1,
        'price' => '30.0000',
        'special_price' => 0,
        'rule_price' => '',
        'attributes' => 
        array (
        0 => 'BLACK',
        1 => 'Medium',
        ),
        'option80' => 18,
        'option125' => 3454,
        'child_product_id' => 6315890,
        'giftcard' => '',
        'whole_preorder' => '',
        'preorder_shipping_date' => NULL,
        'available_qty' => 37,
        'isRefundable' => true,
        'max_sale_qty' => false,
        'isFree' => 0,
        'segment' => 
        array (
        'magento_product_id' => '64334515465',
        'product_id' => 'P193936',
        'quantity' => 1,
        'name' => 'pro one Night Out Mesh Leggings',
        'brand' => 'Widow',
        'price' => 30.0,
        'special_price' => NULL,
        'regular_price' => 30.0,
        'size_type' => 'Regular',
        'manufacturer' => 'Widow',
        'trend' => 'WID goodie Hour 2020',
        'microcategory' => 'Printed Leggings',
        'doll_category' => NULL,
        'stock_quantity' => 10,
        'sku' => 'S493664',
        'child_stock_quantity' => 10,
        'size' => 'Medium',
        'swatch' => 'BLACK',
        ),
    ),
    2 => 
    array (
        'id' => 615445348,
        'name' => 'pro two My Lashes Sunglasses',
        'display_brand' => '',
        'qty' => 1,
        'price' => '15.0000',
        'special_price' => 0,
        'rule_price' => '',
        'attributes' => 
        array (
        0 => 'BLACK',
        1 => 'ONE SIZE',
        ),
        'option80' => 18,
        'option125' => 6212,
        'child_product_id' => 6154345358,
        'giftcard' => '',
        'whole_preorder' => '',
        'preorder_shipping_date' => NULL,
        'available_qty' => 295,
        'isRefundable' => true,
        'max_sale_qty' => false,
        'isFree' => 0,
        'segment' => 
        array (
        'magento_product_id' => '6153453448',
        'product_id' => 'P19645642180',
        'quantity' => 1,
        'name' => 'pro two My Lashes Sunglasses',
        'brand' => '',
        'price' => 15.0,
        'special_price' => NULL,
        'regular_price' => 15.0,
        'size_type' => 'Regular',
        'manufacturer' => 'CIEL',
        'trend' => 'WID goodie Hour 2020',
        'microcategory' => 'Cat Eye Sunglasses',
        'category' => 'Accessories,Sunglasses,Cat Eye Sunglasses',
        'special_category' => 'What\'s New,Char Test Category,Widow',
        'doll_category' => NULL,
        'stock_quantity' => 10,
        'sku' => 'S486477',
        'child_stock_quantity' => 10,
        'size' => 'ONE SIZE',
        'swatch' => 'BLACK',
        ),
    ),
    3 => 
    array (
        'id' => 61465645461,
        'name' => 'pro one Night Out goodie Dress',
        'display_brand' => 'Widow',
        'qty' => 1,
        'price' => '45.0000',
        'special_price' => 0,
        'rule_price' => '',
        'attributes' => 
        array (
        0 => 'BLACK',
        1 => 'X-Large',
        ),
        'option80' => 18,
        'option125' => 3456,
        'giftcard' => '',
        'whole_preorder' => '',
        'preorder_shipping_date' => NULL,
        'available_qty' => 12,
        'isRefundable' => true,
        'max_sale_qty' => false,
        'isFree' => 0,
        'segment' => 
        array (
        'magento_product_id' => '616465461',
        'product_id' => 'P1935446934',
        'quantity' => 1,
        'name' => 'pro one Night Out goodie Dress',
        'brand' => 'Widow',
        'price' => 45.0,
        'special_price' => NULL,
        'regular_price' => 45.0,
        'size_type' => 'Regular',
        'manufacturer' => 'Widow',
        'trend' => 'WID goodie Hour 2020',
        'microcategory' => 'goodie Dresses',
        'category' => 'Clothing,Dresses,Mini,goodie Dresses',
        'special_category' => 'Brandsgoodie,Char Test Category,Widow,Widow',
        'doll_category' => NULL,
        'stock_quantity' => 10,
        'sku' => 'S493652',
        'child_stock_quantity' => 10,
        'size' => 'X-Large',
        'swatch' => 'BLACK',
        ),
    ),
    4 => 
    array (
        'id' => 6154566225,
        'name' => 'Feelings Maxi Dress',
        'display_brand' => 'Widow',
        'qty' => 1,
        'price' => '58.0000',
        'special_price' => 0,
        'rule_price' => '',
        'attributes' => 
        array (
        0 => 'BLACK',
        1 => 'Large',
        ),
        'option80' => 18,
        'option125' => 3455,
        'child_product_id' => 61456455677,
        'giftcard' => '',
        'whole_preorder' => '',
        'preorder_shipping_date' => NULL,
        'available_qty' => 30,
        'isRefundable' => true,
        'max_sale_qty' => false,
        'isFree' => 0,
        'segment' => 
        array (
        'magento_product_id' => '614565225',
        'product_id' => 'P1945652050',
        'quantity' => 1,
        'name' => 'Phantom Feelings Maxi Dress',
        'brand' => 'Widow',
        'price' => 58.0,
        'special_price' => NULL,
        'regular_price' => 58.0,
        'size_type' => 'Regular',
        'manufacturer' => 'Widow',
        'trend' => 'WID goodie Hour 2020',
        'microcategory' => 'Maxi Dresses',
        'category' => 'Dresses,Midi & Maxi,Maxi Dresses',
        'special_category' => 'Brandsgoodie,Char Test Category,Widow,Widow',
        'doll_category' => NULL,
        'stock_quantity' => 10,
        'sku' => 'S485794',
        'child_stock_quantity' => 10,
        'size' => 'Large',
        'swatch' => 'BLACK',
        ),
    )
    );

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

$itemId = 3;

if (isset($_SESSION['cart'][$itemId])) {
    unset($_SESSION['cart'][$itemId]);
}

print_r($_SESSION['cart']);

现在它将不再返回删除项，除非您破坏了会话。

票数 1
EN

Stack Overflow用户

发布于 2020-11-18 14:08:38

为什么在$item['id']中使用$stmt->bind_param( (而不是$id)。$item不是函数的参数。

类似地，变量$i在$itemId = $i;中来自何处？

我已经写了一个简化的版本，你的问题，它的工作，如预期。它使用一个表单和按钮将数组索引交给PHP脚本。如果您有不同的设置(比如使用Ajax)，则需要澄清这一点。

代码语言：javascript
复制
session_start();

if (!isset($_SESSION['cart']) || sizeof($_SESSION['cart']) === 0)
 {
  echo('Resetting cart.' . PHP_EOL);
  $_SESSION['cart'] = [0 =>'zero', 1 =>'one', 2 =>'two', 3 =>'three', 4 =>'four'];
 }

echo('<pre>before ' . print_r($_SESSION['cart'], TRUE) . '</pre>');

$itemId = isset($_GET['itemid']) ? $_GET['itemid'] : FALSE;
if ($itemId !== FALSE)
 {
  if (isset($_SESSION['cart'][$itemId]))
   {
    echo('Unsetting &raquo;' . $itemId . '&laquo;.' . PHP_EOL);
    unset($_SESSION['cart'][$itemId]);
   }
  else
    echo('&raquo;' . $itemId . '&laquo; not in cart.' . PHP_EOL);
 }
else
  echo('No item ID given.' . PHP_EOL);

echo('<pre>after ' . print_r($_SESSION['cart'], TRUE) . '</pre>');

echo('<form method="get" action="' . $_SERVER['PHP_SELF'] . '">' . PHP_EOL);
foreach ($_SESSION['cart'] as $key=>$value)
  echo('<button name="itemid" value="' . $key .  '">' . $value . '</button>' . PHP_EOL);
echo('</form>' . PHP_EOL);
票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/64800921

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