src/Core/Controller/BaseController.php
protected function getQueryParam(string $param) : ?string
    {
        if ($this->queryParams === null) {
            $this->parseQueryParams();
        }
        return $this->queryParams[$param] ?? null;
    }
protected function getQueryParam(string $param) : ?string
    {
        if ($this->queryParams === null) {
            $this->parseQueryParams();
        }
        return $this->queryParams[$param] ?? null;
    }
protected function getQueryParam ( string $ param ) : ? string { if ( $ this -> queryParams === null ) { $ this -> parseQueryParams ( ) ; } return $ this -> queryParams [ $ param ] ?? null ; }
Gets a query param.

@param string $param
@return string|NULL
Gets a query param .