How to pass values of radios through ajax to php [duplicate] - php

Question

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>
Here is what I get from the page if I hit submit without even filling out data.
Array
(
[name] =>
[email] =>
)
As you see, without touching the input type text, their value was pushed to the $_POST array. How can I do this with the radio box? I essentially want to "set" it, although it is blank just like the text inputs.
I know I could always call
<?php
if(isset($_POST['gender'])) {
//Code
}
?>
But that's not necessarily what I'm looking for. I need it to set automatically. Thanks in advance!

Answer 1

Try this it will work :
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>

Answer 2

Should be :
HTML :
<form action="test.php" method="POST">
<input type="text" name="name">
<input type="text" name="email">
<input type="radio" name="gender" value="male"/>Test
<input type="submit" name="submit" value="submit"/>
</form>
PHP Code :
if(isset($_POST['submit']))
{
echo $radio_value = $_POST["radio"];
}

Answer 3

Consider this example:
// Set a default value as male
<input type="radio" name="gender" checked value="male"> Male
<input type="radio" name="gender" value="femail"> Female
and you will get the value
Array
(
[name] =>
[email] =>
[gender]=>male
)
You only get the checked radio in the $_POST array

Answer 4

If you want to send blank value automatically then
By default checked that radio button and set blank value:
<form action="test.php" method="POST">
<input type="text" name="name">
<input type="text" name="email">
<input type="radio" name="gender" value='' checked>
<input type="submit">
</form>

Answer 5

HTML :
<form action="test.php" method="POST">
<input type="text" name="name">
<input type="text" name="email">
<input type="radio" name="gender" checked value="male"/>Male
<input type="radio" name="gender" value="female"/>Female
<input type="submit" name="submit" value="submit"/>
</form>
PHP :
if(isset($_POST)) {
echo '<pre>';
print_r($_POST);
echo '</pre>';
}

Answer 6

<form action="" method="POST">
<input type="text" name="name">
<input type="text" name="email">
<input type="radio" name="gender" checked value="male"> Male
<input type="radio" name="gender" value="femail"> Female
<input type="submit" value="submit">
</form>
<?php
if(isset($_POST)) {
echo '<pre>';
print_r($_POST);
echo '</pre>';
}
?>