    public function getBoolean($key, $default = false, $deep = false)
    {
        return $this->filter($key, $default, FILTER_VALIDATE_BOOLEAN, array(), $deep);
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.