php - 微信发送文本消息总是提示错误-PHP中文网问答

用下面的代码页面做服务器配置已经验证提交成功提交成功后我把$wechatObj->valid();一行注释掉了然后加上了$wechatObj->responseMsg();这句话我用调试软件测试发送文本消息时显示下面的错误内容这是为什么？

用浏览器打开这个php页面会报图片中的错误内容

发送文本消息测试会提示下面的错误内容

PHP Deprecated:  Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. 
To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php://input stream instead. in Unknown on line 0
PHP Warning:  Cannot modify header information - headers already sent in Unknown on line 0
PHP Notice:  Undefined index: echostr in C:\PHPstydy\WWW\weixin\weixin.php on line 16
PHP Notice:  Undefined index: signature in C:\PHPstydy\WWW\weixin\weixin.php on line 71
PHP Notice:  Undefined index: timestamp in C:\PHPstydy\WWW\weixin\weixin.php on line 72
PHP Notice:  Undefined index: nonce in C:\PHPstydy\WWW\weixin\weixin.php on line 73

发送文本消息测试时提示代码报错的具体位置我都标出来了

<?php

define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();
$wechatObj->responseMsg();


class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];               //这里报错
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];         //这里是图片中报错的位置

          //extract post data
        if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
                  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $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>";             
                if(!empty( $keyword ))
                {
                      $msgType = "text";
                    $contentStr = "Welcome to wechat world!";
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }

        }else {
            echo "";
            exit;
        }
    }
        
    private function checkSignature()
    {
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
        
        $signature = $_GET["signature"];         //这里报错
        $timestamp = $_GET["timestamp"];         //这里报错  
        $nonce = $_GET["nonce"];                 //这里报错
                
        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );
        
        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}

?>