Write a PHP program to compute the sum of the three given integers. However, if any of the values is in the range 10..20

<?php
function test($x, $y, $z)
{
  return fix_num($x) + fix_num($y) + fix_num($z);
}


function fix_num($n)
  {
      return (($n < 13 && $n > 9) || ($n > 17 && $n < 21)) ? 0 : $n;
  }
        
echo (test(4, 5, 7))."\n";
echo (test(7, 4, 12))."\n";
echo (test(10, 13, 12))."\n";
echo (test(17, 12, 18))."\n";