<form method="post" action="in.php">
<input type="radio" name="radio" value="Radio 1">Radio 1<br />
<input type="radio" name="radio" value="Radio 2">Radio 2<br />
<input type="radio" name="radio" value="Radio 3">Radio 3<br />
<input type="submit" value="Gönder"><br />
</form>
<?
$veri=  $_POST[radio];
echo $veri;
?>