function doadd($value1, $value2) {
     $result = $value1 + $value2;
     return $result;
}

function doadd($value1, $value2) {
     $result = $value1 + $value2;
     print $result;
}

function doadd($value1, $value2) {
     $result = $value1 + $value2;
     echo $result;
}

function doadd($value1, $value2) {
     $result = $value1 + $value2;
     echo $result;
     return "hi";
     return "bye";
}