Write a PHP function to test whether a number is greater than 30, 20 or 10 using ternary operator

<?php
function trinary_Test($n){
$r = $n > 30
? "greater than 30"
: ($n > 20
? "greater than 20"
: ($n >10
? "greater than 10"
: "Input a number atleast greater than 10!")); 
echo $n." : ".$r."\n";
}
trinary_Test(32);
trinary_Test(21);
trinary_Test(12);
trinary_Test(4);
?>