think\Template::parseTemplateName PHP Method

    private function parseTemplateName($templateName)
    {
        $array = explode(',', $templateName);
        $parseStr = '';
        foreach ($array as $templateName) {
            if (empty($templateName)) {
                continue;
            }
            if (0 === strpos($templateName, '$')) {
                //支持加载变量文件名
                $templateName = $this->get(substr($templateName, 1));
            }
            $template = $this->parseTemplateFile($templateName);
            if ($template) {
                // 获取模板文件内容
                $parseStr .= file_get_contents($template);
            }
        }
        return $parseStr;
    }