exercism-php/scrabble-score/ScrabbleScore.php

<?php

/*
 * By adding type hints and enabling strict type checking, code can become
 * easier to read, self-documenting and reduce the number of potential bugs.
 * By default, type declarations are non-strict, which means they will attempt
 * to change the original type to match the type specified by the
 * type-declaration.
 *
 * In other words, if you pass a string to a function requiring a float,
 * it will attempt to convert the string value to a float.
 *
 * To enable strict mode, a single declare directive must be placed at the top
 * of the file.
 * This means that the strictness of typing is configured on a per-file basis.
 * This directive not only affects the type declarations of parameters, but also
 * a function's return type.
 *
 * For more info review the Concept on strict type checking in the PHP track
 * <link>.
 *
 * To disable strict typing, comment out the directive below.
 */

declare(strict_types=1);

function score(string $word): int {
  $score = 0;
  $chars = mb_str_split(mb_strtoupper($word));
  foreach ($chars as $char) {
    $score += match ($char) {
      'D', 'G' => 2,
      'B', 'C', 'M', 'P' => 3,
      'F', 'H', 'V', 'W', 'Y' => 4,
      'K' => 5,
      'J', 'X' => 8,
      'Q', 'Z' => 10,
      default => 1,
    };
  }
  return $score;
}