code: public function processConfig($config)
      {
          $var_list = $this->getVariableList();
          foreach ($config as $co => $vo) {
              if (is_array($vo)) {
                  $config[$co] = $this->processConfig($vo);
              } else {
                  $config[$co] = str_replace($var_list[0], $var_list[1], $config[$co]);
              }
          }
          return $config;
      }
docs: 处理配置
  
  @param array $config
  @return array