class Version

final class Version {
    private static string $pharVersion = '';
    private static string $version = '';
    
    /**
     * Returns the current version of PHPUnit.
     */
    public static function id() : string {
        if (self::$pharVersion !== '') {
            return self::$pharVersion;
        }
        if (self::$version === '') {
            self::$version = (new VersionId('10.5.38', dirname(__DIR__, 2)))->asString();
        }
        return self::$version;
    }
    public static function series() : string {
        if (str_contains(self::id(), '-')) {
            $version = explode('-', self::id(), 2)[0];
        }
        else {
            $version = self::id();
        }
        return implode('.', array_slice(explode('.', $version), 0, 2));
    }
    public static function majorVersionNumber() : int {
        return (int) explode('.', self::series())[0];
    }
    public static function getVersionString() : string {
        return 'PHPUnit ' . self::id() . ' by Sebastian Bergmann and contributors.';
    }

}