Eccube\Service\PluginService::createTempDir PHP Method

    public function createTempDir()
    {
        @mkdir($this->app['config']['plugin_temp_realdir']);
        $d = $this->app['config']['plugin_temp_realdir'] . '/' . sha1(Str::random(16));
        if (!mkdir($d, 0777)) {
            throw new PluginException($php_errormsg . $d);
        }
        return $d;
    }