<input type="text" name="variable1" value="<?php echo $variable; ?>">
<input type="submit"><input type="text" name="variable" value="yourSetValue" /><textarea name="variable">yourSetValue</textarea><input type="radio" name="variable" value="theRadioValue" checked />
<html>
<head>
</head>
<body>
<form method="post" action=ENGINE.php">
<select name="drop_down">
<option value='' ="selected">Please Select A Option</option>
<option value="opt_1">option 1</option>
</select>
<input type="text" size="50" maxlength="30" name="fullname" />
<input type="submit" value="Submit" name="submit">
</form>
</body>
</html><html>
<head>
</head>
<body>
<?php
if (!isset($_POST['drop_down'];))
{
echo 'The required field is empty, click back and retry.'; ?>
<form>
<input type ="button" name ="back" value="Go Back" onclick="history.go(-1)">
</form>
<?php
} else
{
$drop_down = $_POST['drop_down'];
$fullname = $_POST['fullname'];
// do what ever you want with these varibles/scalars
}
?>
</body>
</html>