php - 石头剪刀布蜥蜴 Spock 在 PHP 中

Question

所以我是 PHP 的新手，正在构建一个 RPSLS 实现，只是为了在命令行中执行。我有一个半工作实现，但有两个问题。

1) 当玩家 2 击败玩家 1 时，下面的代码似乎没有达到 else 条件，我不知道为什么？

2) 这是一组令人难以置信的重复条件。什么是更有效的实现？我真的很想了解如何让它变得更好。

谢谢

<?php

// Assign moves to integers (1 = Rock, 2 = Paper, 3 = Scissors, 4 = Lizard, 5 = Spock)
echo 'Welcome to Rock, Paper Scissors, Lizard, Spock';
echo "\n";

// Randomize Moves
$player1 = rand(1, 5);
$player2 = rand(1, 5);

// Declare wins
$rock_wins = array(3, 4);
$paper_wins = array(1, 5);
$scissors_wins = array(2, 4);
$lizard_wins = array(5, 2);
$spock_wins = array(3, 1);

// Conditional logic for wins
if ($player1 == $player2) {
    echo "Tie.";
    echo "\n";
} elseif ($player1 == 1) {
        if (in_array($player2, $rock_wins)) {
            echo "Player 1 wins";
            echo "\n";
        }
} elseif ($player1 == 2) {
    if (in_array($player2, $paper_wins)) {
            echo "Player 1 wins";
            echo "\n";
        }
} elseif ($player1 == 3) {
    if (in_array($player2, $scissors_wins)) {
            echo "Player 1 wins";
            echo "\n";
        }
}
elseif ($player1 == 4) {
    if (in_array($player2, $lizard_wins)) {
            echo "Player 1 wins";
            echo "\n";
        }
}
elseif ($player1 == 5) {
    if (in_array($player2, $spock_wins)) {
            echo "Player 1 wins";
            echo "\n";
        }
} else {
    echo "Player 2 wins";
}

?>

Answer 1

您可以将逻辑编码为二维数组:

<?php
$play = function ($player1, $player2) {
    $rock = 1;
    $paper = 2;
    $scissors = 3;
    $lizard = 4;
    $spock = 5;
    $matches = array(
        $rock => array($scissor, $lizard),
        $paper => array($rock, $spock),
        $scissors => array($paper, $lizard),
        $lizard => array($spock, $paper),
        $spock => array($scissor, $rock),
    );

    return in_array($player2, $matches[$player1]);
};

// Assign moves to integers (1 = Rock, 2 = Paper, 3 = Scissors, 4 = Lizard, 5 = Spock)
echo 'Welcome to Rock, Paper Scissors, Lizard, Spock';
echo "\n";

// Randomize Moves
$player1 = rand(1, 5);
$player2 = rand(1, 5);

if ($player1 == $player2) {
    echo "Draw!\n";
} else if (Game::play($player1, $player2)) {
    echo "Player 1 wins\n";
} else {
    echo "Player 2 wins\n";
}

显然，改进是无止境的:

• 您可以用二维数组上的闭包(带有 play 方法的类或工厂函数内的嵌套函数)替换该函数，这样您就不会在每次调用时实例化它
• 对于石头、纸等的值，您可以使用常量而不是变量。

• 您应该测试输入是否在有效值集中，等等。

  <?php
  class Game {
      const ROCK = 1;
      const PAPER = 2;
      const SCISSORS = 3;
      const LIZARD = 4;
      const SPOCK = 5;
      const MATCHES = array(
          self::ROCK => array(self::SCISSOR, self::LIZARD),
          self::PAPER => array(self::ROCK, self::SPOCK),
          self::SCISSORS => array(self::PAPER, self::LIZARD),
          self::LIZARD => array(self::SPOCK, self::PAPER),
          self::SPOCK => array(self::SCISSOR, self::ROCK),
      );
  
      public static function play($player1, $player2) {
          if (!self::isValid($player1) || !self::isValid($player2)) {
              throw new Exception('Invalid input!');
          }
          return in_array($player2, self::matches[$player1]);
      }
  
      public static function isValid($num) {
          return array_key_exists(self::MATCHES, $num);
      }
  }