battle.php

<?php
// 7 kyu - Battle of the characters (Easy)
// Description:
// Groups of characters decided to make a battle. Help them to figure out which group is more powerful. Create a function that will accept 2 variables and return the one who's stronger.
//
// Rules:
// Each character have its own power: A = 1, B = 2, ... Y = 25, Z = 26
// Only capital chatacters can and will participate a battle.
// Only two groups to a fight.
// Group whose total power (A + B + C + ...) is bigger wins.
// If the powers are equal, it's a tie.
// Examples:
//   battle("ONE", "TWO"); // => "TWO"`
//   battle("ONE", "NEO"); // => "Tie!"

function power($str) {
  return array_sum(array_map(function($l) {
      return ord($l) - 64;
  }, str_split($str)));
}
function battle($x, $y) {
  $a = power($x);
  $b = power($y);
  return $a === $b ? 'Tie!' : ($a > $b ? $x : $y);
}

?>