$drumImg = array(
1 => '',
2 => '',
3 => '',
4 => '',
5 => '',
6 => '',
7 => ''
);
if($_POST['sw'] == 'stop'){
$drum1 = $drumImg[mt_rand(1,7)];
$drum2 = $drumImg[mt_rand(1,7)];
$drum3 = $drumImg[mt_rand(1,7)];
$formHtml = '';
}elseif($_POST['sw'] == 'start'){
$drum1 = '';
$drum2 = '';
$drum3 = '';
$formHtml = '';
}else{
$drum1 = '';
$drum2 = '';
$drum3 = '';
$formHtml = '';
}
$drum = $drum1 . $drum2 . $drum3 . "
\n";
?>