public function fetchBool(string $key, bool $default = false): bool
    {
        return $this->fetchFilter($key, $default, FILTER_VALIDATE_BOOLEAN);
    }
public function fetchBool(string $key, bool $default = false): bool
    {
        return $this->fetchFilter($key, $default, FILTER_VALIDATE_BOOLEAN);
    }
public function fetchBool ( string $ key , bool $ default = false ) : bool { return $ this -> fetchFilter ( $ key , $ default , FILTER_VALIDATE_BOOLEAN ) ; }
Get parameter value converted to boolean.

@param string $key
@param bool|false $default The default value if parameter does not exist
@return mixed
Get parameter value converted to boolean .