大神能帮忙解决一个公众号的小问题吗？

Question

测试可以正常返回，结果都正常，但是公众号里一直提示：“该公众号提供的服务出现故障，请稍后再试”

倒腾一下午了，迫不得已才来请帮忙，帮一下

http://119.45.5.37/wechat/wechat.php

返回结果:

200 OK

Connection: Keep-Alive

Date: Mon, 01 Jun 2020 12:51:08 GMT

X-Powered-By: PHP/5.6.40

Server: Apache/2.4.37 (Win64) PHP/5.6.40

Content-Type: text/html; charset=UTF-8

Content-Length: 353

<xml>    <ToUserName>        <![CDATA[bbbbbbb]]>    </ToUserName>    <FromUserName>        <![CDATA[aaaaaaa]]>    </FromUserName>    <CreateTime>1591015869</CreateTime>    <MsgType>        <![CDATA[text]]>    </MsgType>    <Content>        <![CDATA[你好啊啊啊]]>    </Content>    <FuncFlag>0</FuncFlag> </xml>

$postStr = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : file_get_contents("php://input");$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);$fromUsername = $postObj->FromUserName;$toUsername = $postObj->ToUserName;$keyword = trim($postObj->Content);$msgType = $postObj -> MsgType;$time = time();$textTpl = "<xml>      <ToUserName><![CDATA[%s]]></ToUserName>      <FromUserName><![CDATA[%s]]></FromUserName>      <CreateTime>%s</CreateTime>      <MsgType><![CDATA[%s]]></MsgType>      <Content><![CDATA[%s]]></Content>      <FuncFlag>0</FuncFlag>      </xml>";$msgType = "text";$contentStr = "你好";$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);echo $resultStr;