Swithc Case Nated On PHP

<?php

// nasted switch case

// even and odd positive negative number code.

$n = 12;
$r = $n % 2;


switch (true) {
    case (0 == $r && $n>0):
        echo "$n is a positive even number";
        break;
    case (1 == $r && $n>0):
        echo "$n is a positive odd number";
        break;
    case (0 == $r && $n<0):
        echo "$n is a negative even number";
        break;
    case (-1 == $r && $n<0):
        echo "$n is a negative odd number";
        break;
}