panel
Github

    public function panel()
    {
        return _class('html')->panel(['title' => 'Panel title', 'body' => 'Panel content']);
    }
    public function panel($extra = [])
    {
        $extra['id'] = $extra['id'] ?: __FUNCTION__ . '_' . ++$this->_ids[__FUNCTION__];
        $extra['class'] = $extra['class'] ?: 'panel panel-default';
        return
            '<div class="' . implode(' ', array_filter([$extra['class'], $extra['class_add']])) . '" id="' . $extra['id'] . '">
				<div class="panel-heading">
					<h3 class="panel-title">' . $extra['title'] . '</h3>
				</div>
				<div class="panel-body">' . $extra['body'] . '</div>
			</div>';
    }

Panel title

Panel content