如何在PHP中获取单选按钮的值？

我创建了一个基本网站，要求用户选择一个单选按钮。我想要一个PHP文件来检索所选单选按钮的值并做出相应的响应，但该文件当前不生成任何输出。我现在使用的代码有什么问题？为什么我的PHP文件不能正确检索单选按钮值

Index.html：

<form method="POST">
    <input type="radio" name="MyRadio" value="First" checked>First<br> //This one is automatically checked when the user opens the page
    <input type="radio" name="MyRadio" value="Second">Second
</form>
<form method="GET" action="Result.php">
    <input type="submit" value="Result" name="Result"> //This button opens Result.php
</form>

首先
//当用户打开页面时，会自动选中此选项
第二
//此按钮打开Result.php

Result.php：

<?php
$radioVal = $_POST["MyRadio"];

if($radioVal == "First")
{
    echo("You chose the first button. Good choice. :D");
}
else if ($radioVal == "Second")
{
    echo("Second, eh?");
}
?>

---

您的通用输入元素使用两个单独的表单，其中一个表单仅包含提交按钮

在第一个表单中包括submit按钮，它应该可以正常工作：

<form method="POST" action="Result.php">
    <input type="radio" name="MyRadio" value="First" checked>First<br> //This one is automatically checked when the user opens the page
    <input type="radio" name="MyRadio" value="Second">Second
    <input type="submit" value="Result" name="Result"> //This button opens Result.php
</form>

首先
//当用户打开页面时，会自动选中此选项
第二
//此按钮打开Result.php

这是正在提交的表单。它有一个action属性，该属性将其指向Result.php

<form method="GET" action="Result.php">
    <input type="submit" value="Result" name="Result"> //This button opens Result.php
</form>

---

首先，你做错了一点。您正在使用两个表单来完成此任务。让我告诉你怎么做

index.html

<form action= "result.php" method="POST">
<input type="radio" name="MyRadio" value="First" checked>First<br> <!--This one is automatically checked when the user opens the page -->
<input type="radio" name="MyRadio" value="Second">Second
<br/>
<input type="submit" value="Result" name="Result"> <!--//This button opens Result.php -->

首先

第二

result.php

    <?php 
        echo $_POST["MyRadio];
        // on new page you will get "First" or "Second", depending on what you have selected on html page
?>

---

您正在为html代码使用两个单独的表单，这意味着当您按下按钮时，第一个表单实际上没有提交

您不需要更改
result.PHP
中的PHP代码，但最好使用一种表单

<form method="POST">
    <input type="radio" name="MyRadio" value="First" checked>First<br> //This one is automatically checked when the user opens the page
    <input type="radio" name="MyRadio" value="Second">Second
    <input type="submit" value="Result" name="Result"> //This button opens Result.php
</form>


首先
//当用户打开页面时，会自动选中此选项
第二
//此按钮打开Result.php

    <?php
if (isset($_POST['Result']))
  {
$radioVal = $_POST["MyRadio"];

if($radioVal == "First")
{
echo("You chose the first button. Good choice. :D");
}
else if ($radioVal == "Second")
{
echo("Second, eh?");
}
}
?>

<form action= "result.php" method="POST">
<input type="radio" name="MyRadio" value="First" checked>First<br> <!--This one is automatically checked when the user opens the page -->
<input type="radio" name="MyRadio" value="Second">Second
<br/>
<input type="submit" value="Result" name="Result"> <!--//This button opens Result.php -->

    <?php 
        echo $_POST["MyRadio];
        // on new page you will get "First" or "Second", depending on what you have selected on html page
?>

<form method="POST">
    <input type="radio" name="MyRadio" value="First" checked>First<br> //This one is automatically checked when the user opens the page
    <input type="radio" name="MyRadio" value="Second">Second
    <input type="submit" value="Result" name="Result"> //This button opens Result.php
</form>