<html>
<body>
<form>
<input type="radio" name="sex" value="male"> Male
<br>
<input type="radio" name="sex" value="female"> Female
<br>
<input type="submit" name="submit" value="Submit">
</form>
<?php
if($_POST['submit'])
{
$sex = $_POST['sex'];
if($sex == "male")
{
echo 'You are male.';
}
else
{
echo 'You are female.';
}
}
?>
</body>
</html>