appid：wxb912852b25c94421

if ($msg['Content'] == 'TESTCOMPONENT_MSG_TYPE_TEXT') {
            $xml = "<xml><ToUserName><![CDATA[{$FromUserName}]]></ToUserName>
<FromUserName><![CDATA[{$ToUserName}]]></FromUserName>
<CreateTime>{$msg['CreateTime']}</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[TESTCOMPONENT_MSG_TYPE_TEXT_callback]]></Content>
</xml>";
            write_log($xml);
            $returnMsg = "";
            $errCode = $pc->encryptMsg($xml, $timestamp, $nonce, $returnMsg);
            write_log("响应code：" . $errCode);
            write_log("响应内容：" . $returnMsg);
            echo $returnMsg;
        }