使用翻译字符串作为多语言的数组键，如Gettext msgid？

Question

我做了一些测试，将翻译字符串用作数组键，如gettext msgid

简单示例：

function translate( $str, $locale = 'en')
{
    // $languages = load_from_file(); will use fallowing var just for sample
    $languages =[
                'en'    => [
                                'Hello World' => 'Hello World',
                                'What time is it?' => 'What time is it?',
                                'What time is it now?' => 'What time is it now?',
                                'Supported symbols [. ? # $ , / * + - _ ]' => 'Simple supported symbols . ? # $ , / * + - _',
                            ],

                'de'    => [
                                'Hello World' => 'Hallo Welt',
                                'What time is it?' => 'Wie spät ist es?',
                                'What time is it now?' => 'Wie viel Uhr ist es jetzt?',
                                'Supported symbols [. ? # $ , / * + - _ ]' => 'Unterstützte Symbole [. ? # $, / * + - _]',
                            ]
            ];


      $lang = $languages[ $locale ];

    return $lang[ $str ] ?? 'Unknown String';

}

        echo translate( 'Supported symbols [. ? # $ , / * + - _ ]' );
        // returns "Unterstützte Symbole [. ? # $, / * + - _]"
        echo translate( 'What time is it?' );
        // returns "Wie spät ist es?"

优势和优势是什么？缺点还是可以是任何问题？使用它是否安全？