06.NumbersFromNTo1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>First Steps Into PHP</title>

</head>
<body>
<form>
    N: <input type="text" name="num" />
    <input type="submit" />
</form>
<?php
    if (isset($_GET['num'])) {
        $num = intval($_GET['num']);
    }

    for ($i = $num; $i >= 1; $i--) {
        echo $i;
        echo " ";
    }
?>
</body>
</html>