xml的结构

<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[text]]></MsgType>
                <Content><![CDATA[%s]]></Content>
                <FuncFlag>%d</FuncFlag>
            </xml>

xml转成对象

 $postObj = simplexml_load_string($ticket_xml, 'SimpleXMLElement', LIBXML_NOCDATA);

拼装xml

    /**
     * 文本消息组装xml
     *
     * @param unknown $postObj
     * @param unknown $content
     * @param number $funcFlag
     * @return string
     */
    public function event_key_text($postObj, $content, $funcFlag = 0)
    {
        if (! empty($content)) {
            $xmlTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[text]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>%d</FuncFlag>
                        </xml>";
            $resultStr = sprintf($xmlTpl, $postObj->FromUserName, $postObj->ToUserName, time(), $content, $funcFlag);
            return $resultStr;
        }else{
            return '';
        }
    }

/**
 * 返回图文消息组装xml
 *
 * @param unknown $postObj
 * @param unknown $arr_item
 * @param number $funcFlag
 * @return void|string
 */
public function event_key_news($postObj, $arr_item, $funcFlag = 0)
{
    // 首条标题28字，其他标题39字
    if (! is_array($arr_item)) {
        return;
    }
    $itemTpl = "<item>
                    <Title><![CDATA[%s]]></Title>
                    <Description><![CDATA[%s]]></Description>
                    <PicUrl><![CDATA[%s]]></PicUrl>
                    <Url><![CDATA[%s]]></Url>
                </item>
            ";
    $item_str = "";
    foreach ($arr_item as $item) {
        $item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);
    }
    $newsTpl = "<xml>
    <ToUserName><![CDATA[%s]]></ToUserName>
    <FromUserName><![CDATA[%s]]></FromUserName>
    <CreateTime>%s</CreateTime>
    <MsgType><![CDATA[news]]></MsgType>
    <Content><![CDATA[]]></Content>
    <ArticleCount>%s</ArticleCount>
    <Articles>$item_str</Articles>
    <FuncFlag>%s</FuncFlag>
    </xml>";
    $resultStr = sprintf($newsTpl, $postObj->FromUserName, $postObj->ToUserName, time(), count($arr_item), $funcFlag);
    return $resultStr;
}