protected function htmlOptionsExtraButton()
    {
        return array_merge(
                ['type' => 'button'],
                !empty($this->extraButtonOptions) && is_array($this->extraButtonOptions) ? $this->extraButtonOptions : []
            );
    }
protected function htmlOptionsExtraButton()
    {
        return array_merge(
                ['type' => 'button'],
                !empty($this->extraButtonOptions) && is_array($this->extraButtonOptions) ? $this->extraButtonOptions : []
            );
    }
protected function htmlOptionsExtraButton ( ) { return array_merge ( [ 'type' => 'button' ] , ! empty ( $ this -> extraButtonOptions ) && is_array ( $ this -> extraButtonOptions ) ? $ this -> extraButtonOptions : [ ] ) ; }
Sets extra button HTML options.
@return array
Sets extra button HTML options .