code: public function getVariableList()
      {
          if (empty($this->var_list)) {
              $this->var_list = [
                  [],
                  []
              ];
              $list = [
                  '{EXT}' => EXT,
                  '{DS}' => DS,
                  '{THINK_PATH}' => THINK_PATH,
                  '{WEB_PATH}' => WEB_PATH,
                  '{ROOT_PATH}' => ROOT_PATH,
                  '{APP_PATH}' => APP_PATH,
                  '{CONF_PATH}' => CONF_PATH,
                  '{LIB_PATH}' => LIB_PATH,
                  '{CORE_PATH}' => CORE_PATH,
                  '{TRAIT_PATH}' => TRAIT_PATH,
                  '{EXTEND_PATH}' => EXTEND_PATH,
                  '{VENDOR_PATH}' => VENDOR_PATH,
                  '{RUNTIME_PATH}' => RUNTIME_PATH,
                  '{LOG_PATH}' => LOG_PATH,
                  '{CACHE_PATH}' => CACHE_PATH,
                  '{TEMP_PATH}' => TEMP_PATH
              ];
              foreach ($list as $co => $vo) {
                  $this->var_list[0][] = $co;
                  $this->var_list[1][] = $vo;
              }
          }
          return $this->var_list;
      }
docs: 变量列表
  
  @return array