SimpleSAML_Configuration::getOptionalConfig PHP Method

    public static function getOptionalConfig($filename = 'config.php', $configSet = 'simplesaml')
    {
        assert('is_string($filename)');
        assert('is_string($configSet)');
        if (!array_key_exists($configSet, self::$configDirs)) {
            if ($configSet !== 'simplesaml') {
                throw new Exception('Configuration set \'' . $configSet . '\' not initialized.');
            } else {
                self::$configDirs['simplesaml'] = SimpleSAML\Utils\Config::getConfigDir();
            }
        }
        $dir = self::$configDirs[$configSet];
        $filePath = $dir . '/' . $filename;
        return self::loadFromFile($filePath, false);
    }

 /**
  * Determine whether a module is enabled.
  *
  * Will return false if the given module doesn't exists.
  *
  * @param string $module Name of the module
  *
  * @return bool True if the given module is enabled, false otherwise.
  *
  * @throws Exception If module.enable is set and is not boolean.
  */
 public static function isModuleEnabled($module)
 {
     $moduleDir = self::getModuleDir($module);
     if (!is_dir($moduleDir)) {
         return false;
     }
     $globalConfig = SimpleSAML_Configuration::getOptionalConfig();
     $moduleEnable = $globalConfig->getArray('module.enable', array());
     if (isset($moduleEnable[$module])) {
         if (is_bool($moduleEnable[$module]) === true) {
             return $moduleEnable[$module];
         }
         throw new Exception("Invalid module.enable value for for the module {$module}");
     }
     if (assert_options(ASSERT_ACTIVE) && !file_exists($moduleDir . '/default-enable') && !file_exists($moduleDir . '/default-disable')) {
         SimpleSAML_Logger::error("Missing default-enable or default-disable file for the module {$module}");
     }
     if (file_exists($moduleDir . '/enable')) {
         return true;
     }
     if (!file_exists($moduleDir . '/disable') && file_exists($moduleDir . '/default-enable')) {
         return true;
     }
     return false;
 }