php富文本图片传递 通用css更改

    /**
     * 富文本图片通用
     */
    public function set_img_style(&$activity)
    {
        $activity['guest'] = preg_replace("/width: [0-9]*px;/", "max-width:100%;", $activity['guest']);
        $activity['guest'] = preg_replace("/width=\"[0-9]*\"/", "", $activity['guest']);
        $activity['guest'] = str_replace("<img", "<img style='max-width:100%;height:auto;'", $activity['guest']);
        $activity['guest'] = str_replace("style=\"", "style=\"width:100%;", $activity['guest']);
    }