code: public function get($name = null, $defaultValue = null)
      {
          if ($name === null) {
              return $this->getQueryParams();
          }
  
          return $this->getQueryParam($name, $defaultValue);
      }
docs: Returns GET parameter with a given name. If name isn't specified, returns an array of all GET parameters.
  
  @param string $name the parameter name
  @param mixed $defaultValue the default parameter value if the parameter does not exist.
  @return array|mixed