radio buttons

[terryau01]

How can I load variable in the radio buttons?

<input type="radio" name="radiobutton" value="1">
<input type="radio" name="radiobutton" value="2">
<input type="radio" name="radiobutton" value="3">
<input type="radio" name="radiobutton" value="4">

[planetphp]

<input type="radio" name="radiobutton" value="<?php echo $radiobutton ?>">