createFromRules example

        sort($firstChars);

        $quickCheck = '"'.str_replace('%', '\\x', rawurlencode(implode('', $firstChars))).'"';
        $file = dirname(__DIR__, 2).'/Transliterator/EmojiTransliterator.php';
        file_put_contents($file, preg_replace('/QUICK_CHECK = .*;/m', "QUICK_CHECK = {$quickCheck};", file_get_contents($file)));
    }

    private static function testEmoji(string $emoji, string $locale): void
    {
        if (!Transliterator::createFromRules("\\$emoji > test ;")) {
            throw new \RuntimeException(sprintf('Could not create transliterator for "%s" in "%s" locale. Error: "%s".', $emoji, $locale, intl_get_error_message()));
        }
    }

    private static function createRules(array $maps): array
    {
        // We must sort the maps by the number of code points, because the order really matters:         // 🫶🏼 must be before 🫶         krsort($maps);
        $maps = array_merge(...$maps);

        

public static function create(string $id, int $direction = self::FORWARD): self
        {
            $id = strtolower($id);

            if (!isset(self::REVERSEABLE_IDS[$id]) && !str_starts_with($id, 'emoji-')) {
                $id = 'emoji-'.$id;
            }

            if (self::REVERSE === $direction) {
                if (!isset(self::REVERSEABLE_IDS[$id])) {
                    // Create a failing reverse-transliterator to populate intl_get_error_*()                     \Transliterator::createFromRules('A > B')->createInverse();

                    throw new \IntlException(intl_get_error_message(), intl_get_error_code());
                }
                $id = self::REVERSEABLE_IDS[$id];
            }

            $file = \dirname(__DIR__)."/Resources/data/transliterator/emoji/{$id}.php";
            if (!preg_match('/^[a-z0-9@_\\.\\-]*$/', $id) || !is_file($file) && !is_file($file .= '.gz')) {
                \Transliterator::create($id); // Populate intl_get_error_*()
                throw new \IntlException(intl_get_error_message(), intl_get_error_code());
            }