code: public function addRule($url, $rule)
      {
          if (!is_string($url) || !is_array($rule)) {
              throw new \InvalidArgumentException("addRule() expects a string and an array.");
          }
          $this->runtimeRules[$url] = $rule;
      }
docs: Adds an additional ACL rule
  
  Can be used by other plugins to control access to certain pages
  
  @param string $url Url for which the rule applies
  @param array $rule Rule to be added