PackageVersions\FallbackVersions::getVersion PHP Метод

    public static function getVersion(string $packageName) : string
    {
        $versions = iterator_to_array(self::getVersions(self::getComposerLockPath()));
        if (!array_key_exists($packageName, $versions)) {
            throw new \OutOfBoundsException('Required package "' . $packageName . '" is not installed: cannot detect its version');
        }
        return $versions[$packageName];
    }