<?php
$num = 4;
if ($num > 10) {
	if ($num > 20) {
		if ($num > 30) {
			if ($num > 40 {
				echo "the number is greater than 40";
			} else {
				echo "the number is greater than 30, but less than 40";
			}
		}
	}
} else {
	echo "is less than five";
}
?>