我正在尝试在我的网站上制作一个表格，用户可以在其中提交他们的姓名，他们的分数将保存到高分列表中。 （这是一个问答游戏。）
我尝试通过 w3schools 学习使用表单。我使用了这个例子：https://www.w3schools.com/php/php_forms.asp
<html>
<body>
<form action="welcome.php" method="post">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<input type="submit">
</form>
</body>
</html>
welcome.php 看起来像这样：
<html>
<body>
Welcome <?php echo $_POST["name"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?>
</body>
</html>
我逐字复制并粘贴此示例并尝试运行它，但收到此错误消息：
WelcomeWarning: Undefined array key "name" in [filelocation] on line 4
Your email address is:Warning: Undefined array key "email" in [filelocation] on line 5
但是，当我用“get”替换所有“post”时，它就起作用了。为什么？我需要做什么才能使其与 post 一起使用？
编辑：我还在html中留下了“post”，但我用REQUEST替换了welcome.php中的POST。它现在可以工作了，但是我认为它以某种方式使用 GET 而不是 POST，因为我可以看到 URL 中的输入。我绝对需要避免这种情况。 也许这有帮助
谢谢！
你可以直接运行welcome.php页面。
将您的welcome.php替换为
<html>
<body>
<?php if ($_SERVER["REQUEST_METHOD"] == "POST") { ?>
Welcome <?php echo $_POST["name"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?>
<?php }
else{ ?>
<script> location.replace("yourHtmlFileName.html") </script>
<?php } ?>
</body>
</html>
您链接的 W3Schools 页面有 在同一页面上使用 POST 和 GET 的两个示例。
考虑到您说您没有编辑代码，我认为您很可能复制了使用 GET 的第二个示例的 HTML 代码，同时使用了使用 POST 的第一个示例中的 PHP 代码。代码块是下面是。 坦白说，这种事情有时每个人都会发生，请确保补充足够的水分并继续前进！
我遇到类似问题的另一个问题是，我将 html 文件命名为“index.html”，并将 php 文件命名为“index.php”，因为 php 首先处理 php 文件，在我的情况下，更改名称文件对我有用
在你的索引页面中尝试这个 php 代码：
正如您所说，如果您从 w3schools 复制并粘贴了一个示例并得到了这些错误，检查您是否使用带有实时服务器插件的 VSCode
的起源。
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>QUALITY</title>
<link rel="stylesheet" href="../css/style.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link
href="https://fonts.googleapis.com/css2?family=Noto+Serif:wght@800&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap"
rel="stylesheet">
</head>
<body>
<?php include './connect.php'; ?>
<?php
$fullName = $_POST['contact_name'];
$email = $_POST['contact_email'];
$companyName = $_POST['contact_company'];
$login_form = $conn->prepare("insert into contact_info(contact_name, contact_email, contact_company) values(?, ?, ?)");
$login_form->bind_param("sss", $fullName, $email, $companyName);
$execval = $login_form->execute();
$login_form->close();
?>
<header>
<div class="container-fluid">
<div class="border-bottom pb-3 pt-2">
<img class="header-image" src="../images/Maxbyte.jpg" alt="Maxbyte">
</div>
</div>
</header>
<section class="h-100vh bg-light">
<div class="container p-4">
<div class="d-flex justify-content-between align-items-center mb-3">
<h4 class="mb-4 text-center fw-bold">QUALITY</h4>
<select name="" id="to_value" class="p-2 rounded bg-light border-2 border-2 w-150px" required>
<option value="USD">USD</option>
<option value="INR">INR</option>
<option value="AED">AED</option>
</select>
</div>
<div class="border rounded p-4 mx-auto bg-white">
<form id="myForm" class="row g-4 mb-0">
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">Hourly cost for Quality person</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="hourlyCost" class="border rounded p-2 px-3 bg-light w-100"
name="hourlyCost" data-currentcurrency="USD" required>
</div>
</div>
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">No of Machines</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="machines" class="border rounded p-2 px-3 bg-light w-100"
name="machines" required>
</div>
</div>
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">Machine running cost per hour</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="machines_hourly_running_cost"
class="border rounded p-2 px-3 bg-light w-100" name="machines_hourly_running_cost"
required>
</div>
</div>
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">Documentation cost machine per year</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="cost_machine" class="border rounded p-2 px-3 bg-light w-100"
name="cost_machine" data-currentcurrency="USD" required>
</div>
</div>
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">Man Hours per day to copy data from paper forms into database</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="hours_per_day" class="border rounded p-2 px-3 bg-light w-100"
name="hours_per_day" required>
</div>
</div>
<div class="col-lg-6 col-md-6 pb-1">
<label class="mb-2">Number of New setups per month</label>
<div class="h-33px d-flex justify-content-center flex-column">
<input type="text" id="setups" class="border rounded p-2 px-3 bg-light w-100" name="setups"
data-currentcurrency="USD" required>
</div>
</div>
<!--
<div><input type="hidden" class="border rounded p-2 px-3 bg-light w-10" id="to_email"
name="to_email"></div> -->
<div class="col-12 text-center">
<button type="submit"
class="px-5 py-2 rounded text-white border-0 text-decoration-none">Calculate</button>
</div>
</form>
</div>
</div>
</section>
<script>
// var email = "<?php echo "$email" ?>"
// document.getElementById("to_email").value = email
// document.addEventListener("DOMContentLoaded", function () {
// convertCurrency();
// });
const apiKey = "Xi0wAt0uz97w1Am9aSLS6GUkfSKZG7tl";
function change_hourly_cost() {
const fromCurrency = document.getElementById("hourlyCost").dataset.currentcurrency;
// alert(fromCurrency);
const toCurrency = document.getElementById("to_value").value;
// alert(toCurrency);
const amount = document.getElementById("hourlyCost").value;
const url = `https://api.apilayer.com/currency_data/convert?apikey=${apiKey}&from=${fromCurrency}&to=${toCurrency}&amount=${amount}`;
fetch(url)
.then(response => response.json())
.then(data => {
const convertedAmount = data.result;
document.getElementById("hourlyCost").value = convertedAmount;
// Display the profit_unit in the div
// document.getElementById("profit_unit").textContent = `${convertedAmount} ${toCurrency}`;
document.getElementById("hourlyCost").setAttribute("data-currentcurrency", toCurrency);
})
.catch(error => console.error(error));
}
document.getElementById("to_value").addEventListener("input", change_hourlyCost);
function change_machines_hourly_running_cost() {
const fromCurrency = document.getElementById("machines_hourly_running_cost").dataset.currentcurrency;
const toCurrency = document.getElementById("to_value").value;
const amount = document.getElementById("machines_hourly_running_cost").value;
const url = `https://api.apilayer.com/currency_data/convert?apikey=${apiKey}&from=${fromCurrency}&to=${toCurrency}&amount=${amount}`;
fetch(url)
.then(response => response.json())
.then(data => {
const convertedAmount = data.result;
document.getElementById("machines_hourly_running_cost").value = convertedAmount;
// Display the profit_unit in the div
// document.getElementById("profit_unit").textContent = `${convertedAmount} ${toCurrency}`;
document.getElementById("machines_hourly_running_cost").setAttribute("data-currentcurrency", toCurrency);
})
.catch(error => console.error(error));
}
document.getElementById("to_value").addEventListener("input", change_machines_hourly_running_cost);
function change_cost_machine() {
const fromCurrency = document.getElementById("cost_machine").dataset.currentcurrency;
const toCurrency = document.getElementById("to_value").value;
const amount = document.getElementById("cost_machine").value;
const url = `https://api.apilayer.com/currency_data/convert?apikey=${apiKey}&from=${fromCurrency}&to=${toCurrency}&amount=${amount}`;
fetch(url)
.then(response => response.json())
.then(data => {
const convertedAmount = data.result;
document.getElementById("cost_machine").value = convertedAmount;
// Display the profit_unit in the div
// document.getElementById("profit_unit").textContent = `${convertedAmount} ${toCurrency}`;
document.getElementById("cost_machine").setAttribute("data-currentcurrency", toCurrency);
})
.catch(error => console.error(error));
}
document.getElementById("to_value").addEventListener("input", change_cost_machine);
document.getElementById('myForm').addEventListener('submit', function (e) {
e.preventDefault();
// Capture the input values
const hourlyCost = parseFloat(document.getElementById('hourlyCost').value);
const machines = parseFloat(document.getElementById('machines').value);
const machines_hourly_running_cost = parseFloat(document.getElementById('machines_hourly_running_cost').value);
const cost_machine = parseFloat(document.getElementById('cost_machine').value);
const hours_per_day = parseFloat(document.getElementById('hours_per_day').value);
const setups = parseFloat(document.getElementById('setups').value);
const selectedCurrency = document.getElementById('to_value').value;
// Calculate the result
const CostPerMachine = cost_machine * machines;
const costSavedResponse = (((15 / 60) * hours_per_day * runningCost * hourlyCost) * 5) * 12;
const costSavedManPower = hours_per_day * hourlyCost;
const costSaved = CostPerMachine + costSavedResponse + costSavedManPower;
let implementation;
if (selectedCurrency === 'USD') {
implementation = machines * 500 + machines * 100;
} else if (selectedCurrency === 'INR') {
implementation = machines * 83282.50 + machines * 8328.25;
}
else if (selectedCurrency === 'AED') {
implementation = machines * 3673.00 + machines * 367.30;
}
const ROI = (implementation / costSaved) * 12;
// const emailto = "<?php echo "$email" ?>"
// console.log("email", emailto);
// Store the result in localStorage
localStorage.setItem('CostPerMachine', CostPerMachine);
localStorage.setItem('costSavedResponse', costSavedResponse);
localStorage.setItem('costSavedManPower', costSavedManPower);
localStorage.setItem('costSaved', costSaved);
localStorage.setItem('selectedCurrency', selectedCurrency);
localStorage.setItem('implementation', implementation);
localStorage.setItem('ROI', ROI);
localStorage.setItem('hourlyCost', hourlyCost);
localStorage.setItem('machines', machines);
localStorage.setItem('machines_hourly_running_cost', machines_hourly_running_cost);
localStorage.setItem('cost_machine', cost_machine);
localStorage.setItem('hours_per_day', hours_per_day);
localStorage.setItem('setups', setups);
// Redirect to the second page
window.location.href = `./form-2.php?costSaved=${costSaved}&ROI=${ROI}&hourlyCost=${hourlyCost}&machines=${machines}&machines_hourly_running_cost=${machines_hourly_running_cost}&cost_machine=${cost_machine}&hours_per_day=${hours_per_day}&setups=${setups}`;
});
</script>
<script src="../js/script.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</body>
</html>
我收到此消息是因为有条件（PHP）生成的 html 表单并不总是显示。如果显示，一切顺利。如果没有，则数组丢失。因此，与其不将输入字段包含在输出中，不如隐藏输入字段。