检查所有$ _POST值以进行回答和打印

时间:2015-11-05 22:50:59

标签: php html variables post output

我正在创建一个在线杂货网站,用户可以输入他/她的全名&地址,然后继续购买杂货。

有20种杂货可供选择 - 如果用户想要一件商品,他们只需输入他们想要的商品数量;这是20个项目中只有1个的html代码。

        <tr>
           <td> Milk - $3.99/carton </td>
           <td> <input type="number" name="amtMilk" min=0> </td>
        </tr>

在页面底部有一个提交按钮,该按钮指向 php 中的确认页面。确认页面输出用户名称,地址,所有订购的商品以及税前和税后的总和。

我已经为此写了PHP,但它似乎没有正常工作。以下是我的代码缩写为4项:

<?php
   <h2> Customer Details: </h2>
   <p>Customer Name: </p> echo $_POST['Name'];
   <p>Address: </p> echo $_POST['Address'];
   $total = 0;
   <p>You ordered: </p>
   $POSTvalues = array('amtMilk', 'amtEggs', 'amtBread', 'amtCereal');
   foreach($POSTvalues as $key) {
      if ($_POST['amtMilk'] > 0) {
         $total+= 3.99*($_POST['amtMilk']);
         echo "Milk";
      }
      elseif ($_POST['amtEggs'] > 0 ) {
         $total+= 2.99*($_POST['amtEggs']);
         echo "Eggs";
      }
      elseif ($_POST['amtBread'] > 0 ) {
         $total+= 1.50*($_POST['amtBread']);
         echo "Bread";
      }
      elseif ($_POST['amtCereal'] > 0 ) {
         $total+= 4.99*($_POST['amtCereal']);
         echo "Cereal";
      }
   }
   echo "Your total before Tax is: $total"; <br>
   $afterTax = $total*0.13 + $total
   $afterDelivery = $afterTax + 3.50
   echo "Your total after tax is: $afterTax"; <br>
   echo "Your total after delivery is: $afterDelivery";<br>

   <h3> GRAND TOTAL: </h3> echo "$afterDelivery"; 

?>

任何人都可以指出我做错了什么或我如何解决这个问题以获得所需的输出?

3 个答案:

答案 0 :(得分:2)

不需要 foreach 循环,因此不需要 $ POSTvalues 数组。

使用独立 if 语句而不使用 elseif

一个小的伪代码......

if (value1 > 0 )
{
  add to total
  print item
}

if (value2 > 0 )
{
  add to total
  print item
}

if (value3 > 0 )
{
  add to total
  print item
}

if (value4 > 0 )
{
  add to total
  print item
}

答案 1 :(得分:2)

有趣的事实:PHP将带有name结构化数组的元素转换为PHP数组。

所以,你可以这样做:

<?php
$array = array(
    "milk" => array(
        "price" => 3.99,
        "unit"  => "carton",
    ),
    "eggs" => array(
        "price" => 2.99,
        "unit"  => "dozen",
    ),
);
if (isset($_POST['amt'])) {
    var_dump($_POST['amt']);
    $total = 0;
    foreach ($_POST['amt'] as $name=>$num) {
        if($num > 0) {
            $price = $array[$name]['price'];
            $amt = $_POST['amt'];
            $total += $price * $num;
            echo $num . " " . ucfirst($name) . ", ";

        }
    }

    echo "<br />Your total before Tax is: $total<br />";
    $afterTax = $total*0.13 + $total; 
    $afterDelivery = $afterTax + 3.50;
    echo "Your total after tax is: $afterTax<br />";
    echo "Your total after delivery is: $afterDelivery<br />";
    echo '<form method="POST"><button type="submit">Back</button></form>';
} else {
?><form method="POST"><table><?php
    foreach ($array as $name=>$item) {

        ?>
        <tr>
           <td> <?php echo ucfirst($name); ?> - $<?php echo $item['price']; ?>/<?php echo $item['unit']; ?> </td>
           <td> <input type="number" name="amt[<?php echo $name; ?>]" min=0> </td>
        </tr><?php
    }
?></table><input type="submit"></form><?php
}

我会考虑将您的价格作为隐藏字段(例如,名称为price[milk]),或者在您提交表单后确保您的数组可用,就像我上面所做的那样。这样你就不必硬编码价格了。你拥有它的方式,如果价格发生变化,它将成为改变的噩梦!

要添加新项目,您只需向$array添加新的键/数组对即可。后端没有额外的编码。只是结果。

查看here

答案 2 :(得分:1)

你做错了很多事。

那么,如何在不使用html的情况下在php内显示print/echo

所以这里修改了代码,希望这能解决您的问题。

<?php
echo '<h2> Customer Details: </h2>';
echo '<p>Customer Name: </p>'. $_POST['Name'];
echo '<p>Address: </p>'. $_POST['Address'];
$total = 0;
echo '<p>You ordered: </p>';
$POSTvalues = array('amtMilk', 'amtEggs', 'amtBread', 'amtCereal');
//foreach($POSTvalues as $key)
 {
    if (isset($_POST['amtMilk']) && $_POST['amtMilk'] > 0) {
        $total+= 3.99*($_POST['amtMilk']);
        echo "Milk";
    }
    if (isset($_POST['amtEggs']) && $_POST['amtEggs'] > 0) {
        $total+= 2.99*($_POST['amtEggs']);
        echo "Eggs";
    }
    if (isset($_POST['amtBread']) && $_POST['amtBread'] > 0) {
        $total+= 1.50*($_POST['amtBread']);
        echo "Bread";
    }
    if (isset($_POST['amtCereal']) && $_POST['amtCereal'] > 0 ) {
        $total+= 4.99*($_POST['amtCereal']);
        echo "Cereal";
    }
}
echo "Your total before Tax is: $total<br />";
$afterTax = $total*0.13 + $total; 
$afterDelivery = $afterTax + 3.50;
echo "Your total after tax is: $afterTax<br />";
echo "Your total after delivery is: $afterDelivery<br />";

echo "<h3> GRAND TOTAL: </h3>$afterDelivery"; 

?>

修改

注释掉foreach($POSTvalues as $key)并将所有elseif更改为if

if语句中添加另一个条件,例如此&& $_POST['amtCereal'] > 0,以确保其值大于0