PhpBrew\Command\InstallCommand::installAs PHP Метод

    protected function installAs($source, $target, $override = false)
    {
        if (file_exists($source)) {
            if ($override || !file_exists($target)) {
                return copy($source, $target);
            } else {
                $this->logger->notice("Found existing {$target}.");
                return false;
            }
        }
    }