PHP：Foreach回声没有显示任何东西 [英] PHP: Foreach echo not showing anything
问题描述
编辑
我想列出这样的增量： 1.香蕉3单位，价格350 CRC
2. Yougurt 4单位价格2000 CRC
3.等等
4. etc
当前输出只显示最后添加的项目。
这是脚本：
<？php
session_start（）;
//获取列表
$ list = $ _SESSION ['list'];
//股票
$产品=数组（
'Pineaple'=> 500，'Banana'=> 50，'芒果'=> 150，
'Milk'=> 500，'Coffe'=> 1200，'Butter'=> 300，
'Bread'=> 450，'Juice' '花生'=> 800，
'酸奶'=> 450，'Beer'=> 550，'Wine'=> 2500，
）。
$ b $ //保存这些东西
$ _SESSION ['list'] = array（$ b $'item'=>（$ _POST ['product']），
'quantity'=>（$ _POST ['quantity']），
'code'=>（$ _POST ['code']），
）;
// price
$ price = $ products [（$ _ SESSION ['list'] ['item']）] * $ _SESSION ['list'] ['quantity'];
$ _SESSION ['list'] ['price'] = $ price;
//列出
回显< b> SHOPPIGN LIST< / b>< / br>;
foreach（$ _ SESSION as $ key => $ item）
{
echo $ key ['']，'。 '，$ item ['item']，''，$ item ['quantity']，'units：'，$ item ['price'];
}
//回收清单
$ _SESSION ['list'] = $ list;
echo< / br>< a href ='index.html'>返回索引< / a>< / br>;
//打印会话
var_dump（$ _ SESSION）;
？>
这一行是您的问题。 b
$ b
$ _ SESSION ['list'] = array（'price'=> $ price，）;
您正在设置要迭代的变量是一个具有单个条目的数组在这里，更不用说 $ price 不会是一个嵌套数组，这就是为什么要获得 item ['key '] 失败（如'price'将是您的钥匙， $ price 将会是你的foreach中的项目）。
编辑：
我相信，从第二个快速浏览
$ _ SESSION ['list'] ['price'] = $ price;
如果我错了，请纠正我的错误。
<实际上，再次看，我不太清楚我是否理解你的 $ _ SESSION ['list']的结构。 变量。它看起来像你想要的东西：
（（'item'=>'Banana'，'quantity'=> 1 ...），（'item'=>'Apple'，'quantity'=> 2 ...））
但是你有什么（从你引用 $ _ SESSION ['list'] ['item'] >的事实只有：
（'item'=>'Banana'，'quantity'=> 1 ...）
这里你实际上有多个问题。首先尝试处理 $ _ SESSION ['list'] 的错误结构，然后尝试处理foreach循环。
编辑3：
我仍然不认为你理解我的意思，所以我只是要修复代码是我很确定你在找... ...
我很确定你要做什么看起来像这样：
<？php
session_start（）;
$ products = array（
'Pineaple'=> 500，'Banana'=> 50，'Mango'=> 150，
'Milk'=> 500， Coffe'=> 1200，'Butter'=> 300，
'Bread'=> 450，'Juice'=> 780，'Peanuts'=> 800，
'酸奶' => 450，'Beer'=> 550，'Wine'=> 2500，
）;
if（！array_key_exists（'list'，$ _SESSION））{
$ _SESSION ['list'] = array（）;
}
$ price = $ products [$ _ POST ['product']] * $ _POST ['quantity'];
array_push（$ _ SESSION ['list']，
array（
'item'=> $ _POST ['product']，
'quantity'=> $ _POST ['quantity']，
'code'=> $ _POST ['code']，
'price'=> $ price，
））;
echo< b>购物清单< / b>< / br>;
foreach（$ _ SESSION ['list'] as $ key => $ item）{
echo $ key + 1，'。 '，$ item ['item']，''，$ item ['quantity']，'units：'，$ item ['price'];
}
echo< / br>< a href ='index.html'>返回索引< / a>< / br>
？>
EDIT
Now I can output the current product, but every time the form adds another item it gets overriden. I want to make the list incremental like this:
1. Banana 3 Units, Price 350 CRC
2. Yougurt 4 Units Price 2000 CRC
3. etc etc
4. etc
The current output only shows the last added item.
This is the script:
<?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);
?>
This line is your issue.
$_SESSION['list'] = array('price' => $price,);
You're setting the variable you're trying to iterate across to be an array with a single entry in it, not to mention the fact that $price isn't going to be a nested array, which is why trying to get item['key'] is failing (as in 'price' will be your key and $price will be your item in your foreach).
EDIT:
I believe, from a second quick glance you're actually intending to do this:
$_SESSION['list']['price'] = $price;
correct me if I'm wrong.
EDIT 2:
Actually, looking again, I'm not quite sure I understand your structure for your $_SESSION['list'] variable. It looks like you want something like:
(('item' => 'Banana', 'quantity' => 1...), ('item' => 'Apple', 'quantity' => 2...))
but what you have (from the fact you reference $_SESSION['list']['item']) is only:
('item' => 'Banana', 'quantity' => 1...)
you actually have multiple problems here. First try and deal with the bad structure of $_SESSION['list'] then try and deal with the foreach loop.
EDIT 3:
I still don't think you're quite understanding what I mean, so I'm just going to fix the code to be what I'm pretty sure you're looking for...
I'm pretty sure what you're going for looks something like this:
<?php
session_start();
$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,
);
if(!array_key_exists('list', $_SESSION)){
$_SESSION['list'] = array();
}
$price = $products[$_POST['product']] * $_POST['quantity'];
array_push($_SESSION['list'],
array(
'item' => $_POST['product'],
'quantity' => $_POST['quantity'],
'code' => $_POST['code'],
'price' => $price,
));
echo "<b>SHOPPING LIST</b></br>";
foreach($_SESSION['list'] as $key => $item) {
echo $key+1, '. ', $item['item'], ' ', $item['quantity'], ' units: ', $item['price'];
}
echo "</br> <a href='index.html'>Return to index</a> </br>";
?>
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