Google\Cloud\Dev\Release\Command\Release::updateServiceBuilder PHP Method

    private function updateServiceBuilder($version)
    {
        $path = $this->cliBasePath . '/../' . self::PATH_SERVICE_BUILDER;
        if (!file_exists($path)) {
            throw new RuntimeException('ServiceBuilder not found at ' . $path);
        }
        $sb = file_get_contents($path);
        $replacement = sprintf("const VERSION = '%s';", $version);
        $sb = preg_replace("/const VERSION = '[0-9.]{0,}'\\;/", $replacement, $sb);
        $result = file_put_contents($path, $sb);
        if (!$result) {
            throw new RuntimeException('File write failed');
        }
    }