微信公众号验证服务器资源代码

<?php
//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();
class wechatCallbackapiTest {
	public function valid() {
		$echoStr = $_GET["echostr"];
		//valid signature , option
		if($this->checkSignature()) {
			echo $echoStr;
			exit;
		}
	}
	public function responseMsg() {
		//get post data, May be due to the different environments
		$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
		//extract post data
		if (!empty($postStr)) {
			$postObj = simplexml_load_string($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() {
		$signature = $_GET["signature"];
		$timestamp = $_GET["timestamp"];
		$nonce = $_GET["nonce"];
		$token = TOKEN;
		$tmpArr = array($token, $timestamp, $nonce);
		sort($tmpArr, SORT_STRING);
		$tmpStr = implode( $tmpArr );
		$tmpStr = sha1( $tmpStr );
		if( $tmpStr == $signature ) {
			return true;
		} else {
			return false;
		}
	}
}
?>