I'm trying to set $value1, $value2, $value3 entirely using tertiary operators. This is what it looks like without tertiary

if ($chk1 == 20) {
  $value1 = true;                        
   if ($chk2 == 40) {
      $value2  = 100 ;
      $value3 = 300;
   } else {
      $value2 = 200 ;
      $value3 = 400;
   }
} else {
   $value1 = false;
}

I can set $value2 and $value3, but not sure how to set $value1. Can it be done?

if ($chk1 == 20) {
   $value1 = true;                       
   $value2 = ($chk2 == 40) ? 100 : 200;
   $value3 = ($chk2 == 40) ? 300 : 400;
} else {
   $value1 = false;
}