PHP：SESSION数据没有被存储

Question

该数据来自POST形式，这个想法是简单地添加时增加了一个新的产品更行。

的电流输出为：

l. Banana 3 units: 150 

请看看到脚本（特别foreach循环）：

<?php 

session_start(); 

//Getting the list 
$list= $_SESSION['list']; 


//stock 
$products = array(

     'Pineaple' => 500, 'Banana' => 50, 'Mango' => 150, 
     'Milk' => 500, 'Coffe' => 1200, 'Butter' => 300, 
     'Bread' => 450, 'Juice' => 780, 'Peanuts' => 800, 
     'Yogurt' => 450, 'Beer' => 550, 'Wine' => 2500, 
); 

//Saving the stuff 
$_SESSION['list'] = array(
    'item' => ($_POST['product']), 
    'quantity' => ($_POST['quantity']), 
    'code' => ($_POST['code']), 
); 

//price 
$price = $products[($_SESSION['list']['item'])] * $_SESSION['list']['quantity']; 

$_SESSION['list']['price'] = $price; 


//listing 
echo "<b>SHOPPIGN LIST</b></br>"; 

foreach($_SESSION as $key => $item) 
{ 
    echo $key[''], '. ', $item['item'], ' ', $item['quantity'], ' units: ', $item['price']; 
} 

//Recycling list 
$_SESSION['list'] = $list; 

echo "</br> <a href='index.html'>Return to index</a> </br>"; 


//Printing session 
var_dump($_SESSION); 

?> 

Answer 1

正如iandouglas写道，你每次覆盖会话变量。以下代码还修复了一些未定义的索引问题和已有的产品。

// Test POST data. 
    $_POST['product'] = 'Pineaple'; 
    $_POST['quantity'] = 1; 
    $_POST['code'] = 1; 

    //Getting the list 
    $_SESSION['list'] = isset($_SESSION['list']) ? $_SESSION['list'] : array(); 

    //stock 
    $products = array(
     'Pineaple' => 500, 'Banana' => 50, 'Mango' => 150, 
     'Milk' => 500, 'Coffe' => 1200, 'Butter' => 300, 
     'Bread' => 450, 'Juice' => 780, 'Peanuts' => 800, 
     'Yogurt' => 450, 'Beer' => 550, 'Wine' => 2500, 
    ); 

    //Saving the stuff 
    $new_item = array(
     'item' => $_POST['product'], 
     'quantity' => $_POST['quantity'], 
     'code' => $_POST['code'], 
     'price' => $products[$_POST['product']] * $_POST['quantity'], 
    ); 

    $new_product = true; 
    foreach($_SESSION['list'] as $key => $item) { 
     if ($item['item'] == $new_item['item']) { 
     $_SESSION['list'][$key]['quantity'] += $new_item['quantity']; 
     $_SESSION['list'][$key]['price'] = $products[$new_item['item']] * $new_item['quantity']; 
     $new_product = false; 
     } 
    } 

    if ($new_product) { 
     $_SESSION['list'][] = $new_item;  
    } 
    //listing 
    echo "<b>SHOPPIGN LIST</b></br>"; 
    foreach($_SESSION['list'] as $key => $item) { 
     echo 'key '. $key. ' '. $item['item'], ' ', $item['quantity'], ' units: ', $item['price']. '<br />'; 
    } 

Answer 2

改变这样的代码：

//Saving the stuff 
$_SESSION['list'] = array(
    'item' => ($_POST['product']), 
    'quantity' => ($_POST['quantity']), 
    'code' => ($_POST['code']), 
); 

到

//Saving the stuff 
$_SESSION['list'][] = array(
    'item' => ($_POST['product']), 
    'quantity' => ($_POST['quantity']), 
    'code' => ($_POST['code']), 
); 

，并删除此代码：

//Recycling list 
$_SESSION['list'] = $list; 

现在，你会每次你邮寄到页面时，得到$ _SESSION一个新的条目。

另外，如果你希望你的输出看起来像：

l. Banana 3 units: 150 
2. Orange 5 units: 250 
etc 

那么你就需要从foreach（）循环改变回声

echo $key[''] . // everything else 

只是

echo ($key+1) . // everything else 

由于密钥将您的数组索引从0开始，你需要做一个+1每次迭代，否则你的列表WOU LD看起来像

0. Banana 3 units: 150 
1. Orange 5 units: 250