Cake\View\Helper\FormHelper::fieldset PHP Method

    public function fieldset($fields = '', array $options = [])
    {
        $fieldset = $legend = true;
        $context = $this->_getContext();
        $out = $fields;
        if (isset($options['legend'])) {
            $legend = $options['legend'];
        }
        if (isset($options['fieldset'])) {
            $fieldset = $options['fieldset'];
        }
        if ($legend === true) {
            $actionName = __d('cake', 'New %s');
            $isCreate = $context->isCreate();
            if (!$isCreate) {
                $actionName = __d('cake', 'Edit %s');
            }
            $modelName = Inflector::humanize(Inflector::singularize($this->request->params['controller']));
            $legend = sprintf($actionName, $modelName);
        }
        if ($fieldset !== false) {
            if ($legend) {
                $out = $this->formatTemplate('legend', ['text' => $legend]) . $out;
            }
            $fieldsetParams = ['content' => $out, 'attrs' => ''];
            if (is_array($fieldset) && !empty($fieldset)) {
                $fieldsetParams['attrs'] = $this->templater()->formatAttributes($fieldset);
            }
            $out = $this->formatTemplate('fieldset', $fieldsetParams);
        }
        return $out;
    }