微信公众号 PHP 服务器验证Token代码

<?php
define("TOKEN", "woZiDingYiDe987"); // 这里改成你自己的Token，是自定义的，不过要和微信公众号后台的对应起来
$wechatObj = new wechatCallbackapiTest();
if ($_GET['echostr']) {
    // 验证
    $wechatObj->valid();
} else {
    // 自动恢复消息
    $wechatObj->responseMsg();
}

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

    public function responseMsg()
    {
        $postStr = file_get_contents('php://input'); // 接收XML数据
        if (!empty($postStr)) {
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $fromUsername = $postObj->FromUserName; // 用户open_id
            $toUsername = $postObj->ToUserName; // 开发者的微信账号
            $keyword = trim($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 = "你好，欢迎来到WEB学习";
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
            } else {
                echo "";
            }
        } else {
            echo "";
            exit;
        }
    }

    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];

        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr);
        $tmpStr = implode($tmpArr);
        $tmpStr = sha1($tmpStr);

        if ($tmpStr == $signature) {
            return true;
        } else {
            return false;
        }
    }
}