Even or odd :
 function even_or_odd(int $n): string {
  $EvenOrOdd = "";
  if ($n % 2 == 0) {
    $EvenOrOdd = "Even";
    }
    else {
    $EvenOrOdd = "Odd";
    }
    return $EvenOrOdd;
}

opposite string:
function opposite($n) {
  return -$n;
}


String repeat:
function repeatStr($n, $str) {
  return str_repeat($str, $n);
}


Jenny secret:
function greet($name) {
    if ($name === "Johnny") {
        $msg = "Hello, my love!";
    }
    else {
    $msg = "Hello, " . $name . "!";
    }
    return $msg;
}