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【PHP】Enumでの検証を簡単にする

Last updated at Posted at 2024-07-19

PHPのEnumでの検証

以下のようなEnumがあるとしたとき

enum Test: string
{
    case Test1 = 'test1';
    case Test2 = 'test2';
    case Test3 = 'test3';
}

検証の際いちいち

if ($test === Test::Test1) {}

みたいなことを書くと可読性が悪くなる気がしたので

以下のようなトレイトを用意して

trait EnumIsTrait {
    public static function tryFromName(string $name)
    {
        foreach (self::cases() as $case) {
            if ($case->name === $name) {
                return $case;
            }
        }
        return null;
    }
    

    public function is(string $name)
    {
        return $this === self::tryFromName($name);
    }
    

    public function __call($calledName, $args)
    {
        preg_match('/^is([a-zA-Z0-9]+)$/', $calledName, $matches);
        $caseName = $matches[1] ?? false;
        if ($caseName) {
            return $this->is($caseName);
        }

        throw new \Exception();
    }
}

先ほどのEnumに実装すると

enum Test: string
{
    use EnumIsTrait;
    case Test1 = 'test1';
    case Test2 = 'test2';
    case Test3 = 'test3';
}
if ($test->isTest1()) { }

のような形で検証ができると思います。
関数の実態はないので、@method などを定義しておくと良いと思います。

確認用コード

<?php

enum Test: string
{
    use IsEnumTrait;
    
    case Test1 = 'test1';
    case Test2 = 'test2';
    case Test3 = 'test3';
}

trait IsEnumTrait {

    /**
     * Enumの name から Enumを取得
     */
    public static function tryFromName(string $name)
    {
        foreach (self::cases() as $case) {
            if ($case->name === $name) {
                return $case;
            }
        }
        return null;
    }
    

    /**
     * 現在のEnumが name のEnumかどうか検証
     */
    public function is(string $name)
    {
        return $this === self::tryFromName($name);
    }
    

    public function __call($calledName, $args)
    {
        preg_match('/^is([a-zA-Z0-9]+)$/', $calledName, $matches);
        $caseName = $matches[1] ?? false;
        if ($caseName) {
            return $this->is($caseName);
        }

        throw new \Exception();
    }
}

var_dump(Test::Test1->isTest1());
var_dump(Test::Test2->isTest1());

// outputs
// bool(true)
// bool(false)

laravelのモデルのプロパティにEnumをセットして判定する際は
$casts = [];
でEnumへの変換を設定していると
$this->xxxx->is〇〇();
で判定できるので一行あたりが短く書けるかなと思いました。

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