Question

使用 MySQL 查询在每个div中总结了5种价格，并且效果很好。

然后，我希望通过给它们每个$_SESSION变量之前得到这5个总值的总和，然后再将它们加起来。它只获得第一个价格，但仍能完美地总结它们。

（例如$extra_price为25，如果我$extra_price+$extra_price $total可以获得50）

让我们说，如果（例如$extra_price为25且$decoprice为10，那么我总和$extra_price+$decoprice $total仅显示25）10已被忽略。

知道如何完美地获得总和吗？

以下是我的代码：

<?php 
                $extra_price = $_SESSION['extra_price'];
                $decoprice = $_SESSION['decoprice'];
                $foodprice = $_SESSION['foodprice'];
                $drinksprice =  $_SESSION['drinksprice'];
                $venueprice = $_SESSION['venueprice'];

                $total = $extra_price+$decoprice+$foodprice+$drinksprice+$venueprice;           
                ?>
                        <center><b>Total <?php echo $total ?></b></center>

Answer 1

你不应该使用这种语法

$_SESSION['decoprice'] = $show_pextra['SUM(decoprice)'];

尝试为您命名SUM(decoprice)并使用它来注册会话。

select SUM(decoprice) as sum_decoprice from selectdeco where title = '$title'
$_SESSION['decoprice'] = $show_pextra['sum_decoprice '];

Answer 2

你不需要所有这些额外的变量，你可以这样写：

$total = 0;
$keys = array('extra_price', 'decoprice', 'foodprice', 'drinksprice', 'venueprice');
foreach ($keys AS $key)
{
    $total += $_SESSION[$key];
}

显然，这是无关紧要的，只是风格问题。在任何情况下，+运算符都会为您完美地求和。这就是它的作用。它总结了一些事情。完美。

但问题是，没有人知道你的$ _SESSION中有什么。你呢？为什么不尝试将其记录在某处或至少做到：

print_r($_SESSION);

然后你会发现你的会话可能并不包含你的想法。

Answer 3

嘿，首先，你不需要在这里开会。在代码顶部简单声明总变量，并使用加号替换每个会话的总变量。并删除额外的变量。

替换

$_SESSION['extra_price'] = $show_pextra['SUM(price)'];

用

$total += $show_pextra['SUM(price)'];

完成所有会话。

以下是您的完整代码：

<?php $total = 0;?>
<tr><!--extra-->
    <td style="width:120px;border:2px solid #000;">&nbsp;&nbsp;Extra Item:</td>
    <td style="border:2px solid #000;">
    <?php
        $read_allextra = mysql_query("select * from selectextra where title = '$title'");
        while($show_allextra = mysql_fetch_array($read_allextra))
        {
            ?>
                <b>&diams; <?php echo $show_allextra['extraitem'] ?></b></br>
            <?php
        }

    ?></td>
    <td style="width:120px;border:2px solid #000;">
    <?php
        $read_pextra = mysql_query("select SUM(price) from selectextra where title = '$title'");

        while($show_pextra = mysql_fetch_array($read_pextra))
        {
            ?>
                <center><b>RM <?php echo $show_pextra['SUM(price)'] ?></b></center>
            <?php
            $total += $show_pextra['SUM(price)'];
        }
    ?>

    </td>
</tr>

<tr><!--deco-->
    <td style="width:120px;border:2px solid #000;">&nbsp;&nbsp;Decoration :</td>
    <td style="border:2px solid #000;">
    <?php
        $read_alldeco = mysql_query("select * from selectdeco where title = '$title'");
        while($show_alldeco = mysql_fetch_array($read_alldeco))
        {
            ?>
                <b>&diams; <?php echo $show_alldeco['decoitem'] ?></b></br>
            <?php
        }

    ?>

    </td>
    <td style="width:120px;border:2px solid #000;">
        <?php
        $read_pdeco = mysql_query("select SUM(decoprice) from selectdeco where title = '$title'");

        while($show_pdeco = mysql_fetch_array($read_pdeco))
        {
            ?>
                <center><b>RM <?php echo $show_pdeco['SUM(decoprice)'] ?></b></center>
            <?php
            $total += $show_pextra['SUM(decoprice)'];
        }
    ?>
    </td>
</tr>   

<tr><!--food-->
    <td style="width:120px;border:2px solid #000;">&nbsp;&nbsp;Foods :</td>
    <td style="border:2px solid #000;">
    <?php
        $read_allfood = mysql_query("select * from selectfood where title = '$title'");
        while($show_allfood = mysql_fetch_array($read_allfood))
        {
            ?>
                <b>&diams; <?php echo $show_allfood['fooditem'] ?></b></br>
            <?php
        }

    ?>
    </td>
    <td style="width:120px;border:2px solid #000;">
    <?php
        $read_pfood = mysql_query("select SUM(foodprice) from selectfood where title = '$title'");

        while($show_pfood = mysql_fetch_array($read_pfood))
        {
            ?>
                <center><b>RM <?php echo $show_pfood['SUM(foodprice)'] ?></b></center>
            <?php
            $total += $show_pextra['SUM(foodprice)'];
        }
    ?>
    </td>
</tr>

<tr><!--drinks-->
    <td style="width:120px;border:2px solid #000;">&nbsp;&nbsp;Drinks :</td>
    <td style="border:2px solid #000;">
    <?php
        $read_alldrinks = mysql_query("select * from selectdrinks where title = '$title'");
        while($show_alldrinks = mysql_fetch_array($read_alldrinks))
        {
            ?>
                <b>&diams; <?php echo $show_alldrinks['drinksitem'] ?></b></br>
            <?php
        }

    ?>
    </td>
    <td style="width:120px;border:2px solid #000;">
    <?php
        $read_pdrinks = mysql_query("select SUM(drinksprice) from selectdrinks where title = '$title'");

        while($show_pdrinks = mysql_fetch_array($read_pdrinks))
        {
            ?>
                <center><b>RM <?php echo $show_pdrinks['SUM(drinksprice)'] ?></b></center>
            <?php
            $total += $show_pextra['SUM(drinksprice)'];
        }
    ?>
    </td>
</tr>

<tr><!--venue-->
    <td style="width:120px;border:2px solid #000;">&nbsp;&nbsp; Venue :</td>
    <td style="border:2px solid #000;">
    <?php
        $read_allvenue = mysql_query("select * from selectvenue where title = '$title'");
        while($show_allvenue = mysql_fetch_array($read_allvenue))
        {
            ?>
                <b>&diams; <?php echo $show_allvenue['venuename'] ?></b></br>
            <?php
        }

    ?>
    </td>
    <td style="width:120px;border:2px solid #000;">
    <?php
        $read_pvenue = mysql_query("select venueprice from selectvenue where title = '$title'");

        while($show_pvenue = mysql_fetch_array($read_pvenue))
        {
            ?>
                <center><b>RM <?php echo $show_pvenue['venueprice'] ?></b></center>
            <?php
            $total += $show_pextra['SUM(venueprice)'];
        }
    ?>
    </td>
</tr>

<tr>
    <td style="border:2px solid #000;" colspan="2">
    <center><input type="submit"  class="button" style="width:300px;" value="Pay Now" name="send_payment"/></center></td>
    <td style="width:120px;border:2px solid #000;">
        <center><b>Total <?php echo $total ?></b></center>
    </td>
</tr>

PHP - 仅获得第一个总和数

3 个答案: