Get value from array

Get value from array

I've following php code which store value to an Array called ch[].
echo "<input type='radio' name='ch[$roll]['$sname']['$class']' value='1'
/>&nbsp;";
echo "<input type='radio' name='ch[$roll]['$sname']['$class']' value='0' />";
Now I can get only $roll and value wtih following code
foreach($_POST['ch'] as $id=>$value)
{
echo "id = $id ";
echo "VAlue = $value; <br/>";
}
but I want to get the value of $sname, $class variable. Is there anyway to
get these value. Can you guys give me a idea or solutions ?
Thank You.