code: private function setDebugCfg($cfg)
      {
          if (isset($cfg['key'])) {
              $cfg = \array_merge($cfg, $this->debugKeyValues($cfg['key']));
          }
          if (isset($cfg['logEnvInfo']) && \is_bool($cfg['logEnvInfo'])) {
              $keys = \array_keys($this->cfg['logEnvInfo']);
              $cfg['logEnvInfo'] = \array_fill_keys($keys, $cfg['logEnvInfo']);
          }
          if (isset($cfg['logServerKeys'])) {
              // don't append, replace
              $this->cfg['logServerKeys'] = array();
          }
          $this->cfg = $this->debug->utilities->arrayMergeDeep($this->cfg, $cfg);
      }
docs: Set Debug config
  
  @param array $cfg Debug config values
  
  @return void