private function prepareRestart()
    {
        $error = '';
        $iniFiles = self::getAllIniFiles();
        $scannedInis = count($iniFiles) > 1;
        $tmpDir = sys_get_temp_dir();

        if (!$this->cli) {
            $error = 'Unsupported SAPI: '.PHP_SAPI;
        } elseif (!defined('PHP_BINARY')) {
            $error = 'PHP version is too old: '.PHP_VERSION;
        } elseif (!$this->checkConfiguration($info)) {
            $error = $info;
        } elseif (!$this->checkScanDirConfig()) {
            $error = 'PHP version does not report scanned inis: '.PHP_VERSION;
        } elseif (!$this->checkMainScript()) {
            $error = 'Unable to access main script: '.$this->script;
        } elseif (!$this->writeTmpIni($iniFiles, $tmpDir, $error)) {
            $error = $error ?: 'Unable to create temp ini file at: '.$tmpDir;
        } elseif (!$this->setEnvironment($scannedInis, $iniFiles)) {
            $error = 'Unable to set environment variables';
        }

        if ($error) {
            $this->notify(Status::ERROR, $error);
        }

        return empty($error);
    }