企业微信开发url回调成功后的对xml解密出明文

include_once "callback/WXBizMsgCrypt.php";（文件自行去企业微信文档里下载（https://work.weixin.qq.com/api/doc/90000/90138/90307））
$inputXmlData = file_get_contents('php://input');
$p_params = $request->all();

$corpId = ""; //微信应用id

$token = $resMsgtoken['token']; // url验证token
$encodingAesKey = $resMsgtoken['encoding_aes_key'];  // url验证key
$wxcpt = new WXBizMsgCrypt($token, $encodingAesKey, $corpId);
$sReqMsgSig = $p_params['msg_signature'];
$sReqTimeStamp = $p_params['timestamp'];
$sReqNonce = $p_params['nonce'];
$sReqData = $inputXmlData;
$sMsg = "";  // 解析之后的明文
$errCode = $wxcpt->DecryptMsg($sReqMsgSig, $sReqTimeStamp, $sReqNonce, $sReqData, $sMsg);
if ($errCode == 0) {
    //将获取到的xml数据全部转化为Array格式
    $decodeMsg = json_decode(json_encode(simplexml_load_string($sMsg, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

    if (empty($decodeMsg)) {
        Log::info('info', ['sMsg即为xml格式的明文' => $decodeMsg]);
        die();
    }
}