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我正在为我的项目创建发票。共有3页。 我是一个在数据库和PHP新手（只有1个月通过这2个科目崩溃），所以原谅我，如果我的代码/或数据库逻辑缺乏。计算总变量总和的问题
对于所有3页，他们已经连接到数据库，我拿出文件名，以便它不会混乱的代码块。
第一页是发票的形式。用户输入他/她的名字，然后键入描述，金额，数量和折扣变量。点击提交进入第2页。
如果在页面1中输入了多行输入，则第二页更多地是循环变量的后端处理。然后它将所有这些输入解析到名为invoicesub的表中。它还将客户名称编码到底部重定向链接中的URL中。
第三页是我要显示所有这些变量，如客户名称，描述，数量，金额，总额，折扣表中的所有变量，还可以在表invoicesub中创建总变量的总和。我还想将打印的变量的所有变量重新插入同一个数据库中称为invoicefinal的另一个表中。
首页（形式）
<script type="text/javascript">
var count = 0;
function addTextArea(){
count= count+1;
var div = document.getElementById('name');
div.innerHTML += "<div> <input type='text' name='name[]' value='' "+"id=name"+count+"> </div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('quantity');
div.innerHTML += "<div><input type='text' name='quantity[]' value ='' "+"id=quantity"+count+"></div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('amount');
div.innerHTML += "<div><input type='text' name='amount[]' value ='' "+"id=amount"+count+"></div>";
div.innerHTML += "\n<br />";
var div = document.getElementById('discount');
div.innerHTML += "<div><input type='text' name='discount[]' value ='' "+"id=discount"+count+"></div>";
div.innerHTML += "\n<br />";
}
function removeTextArea(){
document.getElementById("name"+count).remove();
document.getElementById("quantity"+count).remove();
document.getElementById("amount"+count).remove();
document.getElementById("discount"+count).remove();
count = count-1;
}
</script>
</head>
<body>
<form action="invoicesubmit.php" method="POST">
<?php
echo "<table border='2'>\n";
echo "<tr>\n";
echo "<th>Description</th>\n";
echo "<th>Quantity</th>\n";
echo "<th>Amount($)</th>\n";
echo "<th>Discount(%)</th>\n";
echo "</tr>";
echo "<tr>";
echo "<td>"?><input type='text' size="50" name='name[]' value='Examination and Consultation' readonly/><?php "</td>";
echo "<td>"?><input type='text' size="50" name='quantity[]' value='' /><?php "</td>";
echo "<td>"?><input type='text' size="50" name='amount[]' value='' /><?php "</td>";
echo "<td>"?><input type='text' size="50" name='discount[]' value='' /><?php "</td>";
echo "</tr>";
echo "<tr>";
echo "<td>"?><div id="name"></div> <?php "</td>";
echo "<td>"?><div id="quantity"></div> <?php "</td>";
echo "<td>"?><div id="amount"></div> <?php "</td>";
echo "<td>"?><div id="discount"></div> <?php "</td>";
echo "</tr>";
?>
Customer Name:
<br />
<input type="text" name="cust_name" value="" />
<br />
<input type="button" value="Add Description" onClick="addTextArea();">
<input type="button" value="Remove Description" onClick="removeTextArea();">
<input type="submit" name="submit" value="submit">
</form>
</body>
</html>
第二页（把各种变量纳入表invoicesub）
if (isset($_POST['submit'])){ // Process the form
$name_array = $_POST['name'];
$quantity_array = $_POST['quantity'];
$amount_array = $_POST['amount'];
$discount_array = $_POST['discount'];
$cust_name_array = mysql_prep($_POST['cust_name']);
for ($i = 0; $i < count($name_array); $i++){
$cust_name = $cust_name_array;
$name = $name_array[$i];
$quantity = $quantity_array[$i];
$amount = $amount_array[$i];
$discount = $discount_array[$i];
$total_amt = ($amount - ($amount * ($discount/100))) * $quantity;
global $connection;
$query = "INSERT INTO invoicesub (";
$query.= " cust_name, description, quantity, amount, discount, total";
$query.= ") VALUES (";
$query.= " '{$cust_name}', '{$name}', {$quantity}, {$amount}, {$discount}, {$total_amt}";
$query.= ")";
$result = mysqli_query($connection, $query);
}
redirect_to("invoicesubmitfinal.php?cname=".urlencode($cust_name));
}
第3页（试图总和变量）
<?php
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>Total_amt</th>\n";
echo "</tr>";
global $connection;
$sql1="SELECT sum(amount) as amount, sum(quantity) as quantity, sum(total) as total FROM invoicesub where cust_name=$name";
$result2 = mysqli_query($connection, $sql1) or die(mysqli_error());
while ($rows = mysql_fetch_array($result2)){
echo "<tr>";
echo "<td>" . $rows['quantity'] . "</td>";
echo "<td>" . $rows['amount'] . "</td>";
echo "<td>" . $rows['discount']. "%" . "</td>";
echo "<td>" ."$". $rows['total'] . "</td>";
echo "<td>" . "$" . $total_amt . "</td>";
echo "</tr>";
echo $rows['amount'];
echo $rows['quantity'];
echo $rows['total'];
}
?>
问题是......？ – panoptical
你需要两个查询。一个获得每个单独的项目并显示它们，然后第二个获得所有总数。或者，您可以在打印每个项目时使用PHP计算总计。 – Barmar
警告：mysqli_error（）期望恰好有1个参数，第0行给出的/home/mydentis/public_html/test/invoicesubmitfinal.php中的0 0 这是我得到的问题。它来自第3页（invoicesubmitfinal） – user3300482