即使字段为空，如何将单选或复选框值发送到 $_POST 数组?

How can I send a radio or checkbox value to the $_POST array even when the field is empty?

<?php
    if(isset($_POST)) {
        echo '<pre>';
        print_r($_POST);
        echo '</pre>';
    }
?>

<form action="test.php" method="POST">
    <input type="text" name="name">
    <input type="text" name="email">
    <input type="radio" name="gender">

    <input type="submit"> 
</form>

如果我在没有填写数据的情况下点击提交，这就是我从页面中得到的结果.

Here is what I get from the page if I hit submit without even filling out data.

Array
(
    [name] => 
    [email] => 
)

如您所见，在不触及输入类型文本的情况下，它们的值被推送到 $_POST 数组.如何使用单选框做到这一点?我基本上想设置"它，虽然它和文本输入一样是空白的.

As you see, without touching the input type text, their value was pushed to the $_POST array. How can I do this with the radio box? I essentially want to "set" it, although it is blank just like the text inputs.

我知道我总是可以打电话

I know I could always call

<?php
  if(isset($_POST['gender'])) {
     //Code
  }
?>

但这不一定是我想要的.我需要它自动设置.提前致谢！

But that's not necessarily what I'm looking for. I need it to set automatically. Thanks in advance!

推荐答案

试试这个就行了:

Unchecked radio 元素不会被提交，因为它们不被视为成功.所以你必须检查它们是否使用 isset 或 empty 函数发送.

Unchecked radio elements are not submitted as they are not considered as successful. So you have to check if they are sent using the isset or empty function.

<?php
    if(isset($_POST)) {
        echo '<pre>';
        print_r($_POST);
        echo '</pre>';
    }
?>

<form action="test.php" method="POST">
    <input type="text" name="name">
    <input type="text" name="email">
    <input type="radio" name="Gender" value="1"/>Male
    <input type="submit" name="submit" value="submit"/>
</form>