获取PHP中特定列下的值总和

-3

我想从该列所有值的一个总和，Totalamt 将Total:下显示

有人可以帮忙与编码，因为totalamt值通过减法乘法结果得到因折扣等，不是简单地定义为$ row ['totalamt']，就像我看到其他来源是如何。

发票

<body> 


<?php 
if (isset($_POST['submit'])) { 

$name_array = $_POST['name']; 
$quantity_array = $_POST['quantity']; 
$amount_array = $_POST['amount']; 
$discount_array= $_POST['discount']; 

for ($i =0; $i < count($name_array); $i++) { 

$name = $name_array[$i]; 
$quantity = $quantity_array[$i]; 
$amount = $amount_array[$i]; 
$discount = $discount_array[$i]; 


echo "<table border='1'>\n"; 
echo "<tr>\n"; 
echo "<th>Description</th>\n"; 
echo "<th>Quantity</th>\n"; 
echo "<th>Amount($)</th>\n"; 
echo "<th>Discount(%)</th>\n"; 
echo "<th>Totalamt</th>\n"; 
echo "</tr>"; 

echo "<tr>"; 
echo "<td>" . $name . "</td>"; 
echo "<td>" . $quantity . "</td>"; 
echo "<td>" ."$" . $amount . "</td>"; 
echo "<td>" . $discount . "%" . "</td>"; 
echo "<td>" . "$" . ($amount - ($amount * ($discount/ 100))) * $quantity . "</td>"; 

echo "</tr>"; 

echo "total:"; 


} 
} 

?> 




</body> 
</html>`

来源

2014-02-12 user3300482

你在问怎么做基础数学？ – PeeHaa

好的，如果不使用SQL，是否可以将特定列中的值设置为单个变量以'echo'-ed？ – user3300482

您是否尝试过使用类似TOTAL_AMOUNT变量之前声明它的循环，只是在其中加入量和循环之后表现出来。

<body> 


<?php 
if (isset($_POST['submit'])) { 

$name_array = $_POST['name']; 
$quantity_array = $_POST['quantity']; 
$amount_array = $_POST['amount']; 
$discount_array= $_POST['discount']; 
$total_amount=0; 
for ($i =0; $i < count($name_array); $i++) { 

$name = $name_array[$i]; 
$quantity = $quantity_array[$i]; 
$amount = $amount_array[$i]; 
$discount = $discount_array[$i]; 


    echo "<table border='1'>\n"; 
echo "<tr>\n"; 
echo "<th>Description</th>\n"; 
echo "<th>Quantity</th>\n"; 
echo "<th>Amount($)</th>\n"; 
echo "<th>Discount(%)</th>\n"; 
echo "<th>Totalamt</th>\n"; 
echo "</tr>"; 

echo "<tr>"; 
echo "<td>" . $name . "</td>"; 
echo "<td>" . $quantity . "</td>"; 
echo "<td>" ."$" . $amount . "</td>"; 
echo "<td>" . $discount . "%" . "</td>"; 
echo "<td>" . "$" . ($amount - ($amount * ($discount/ 100))) * $quantity . "</td>"; 
$total_amount+=($amount - ($amount * ($discount/ 100))) * $quantity; 
echo "</tr>"; 

} 
echo "total: ".$total_amount; 
} 

?> 




</body> 
</html>`

来源

2014-02-12 08:42:31

获取PHP中特定列下的值总和

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