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@ 2021-02-24T16:19:39Z

<?php

namespace Janken;

use Closure;

const WIN_LOSE_TABLE = [
    'グー' => ['チョキ' => 1, 'パー' => -1],
    'チョキ' => ['パー' => 1, 'グー' => -1],
    'パー' => ['グー' => 1, 'チョキ' => -1],
];

const EMOJI_TABLE = [
    'グー' => '✊',
    'チョキ' => '✌',
    'パー' => '🖐',
];

$printer = fn(string $my_hand, string $your_hand, int $result): string =>
    sprintf("[%s vs %s] %s",
        EMOJI_TABLE[$my_hand],
        EMOJI_TABLE[$your_hand],
        match ($result) {
            -1 => 'あなたの負け',
            0 => 'あいこ',
            1 => 'あなたの勝ち',
        }
    );

foreach (['グー', 'チョキ', 'パー'] as $my_hand) {
    foreach (['グー', 'チョキ', 'パー'] as $your_hand) {
        echo battle($my_hand, $your_hand, $printer), PHP_EOL;
    }
}

function battle(string $my_hand, string $your_hand, Closure $printer): string
{
    return $printer($my_hand, $your_hand, WIN_LOSE_TABLE[$my_hand][$your_hand] ?? 0);
}

Output for git.master, git.master_jit, rfc.property-hooks: [✊ vs ✊] あいこ [✊ vs ✌] あなたの勝ち [✊ vs 🖐] あなたの負け [✌ vs ✊] あなたの負け [✌ vs ✌] あいこ [✌ vs 🖐] あなたの勝ち [🖐 vs ✊] あなたの勝ち [🖐 vs ✌] あなたの負け [🖐 vs 🖐] あいこ

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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