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header("content-type: text");

define("TOKEN", "weixin");

$wechatObj = new wechatCallbackapiTest();

if(isset($_GET["echostr"])){

$wechatObj->valid();

}else{

$wechatObj->responseMsg();

}

// 定义类

class wechatCallbackapiTest

{

public function valid()

{

$echoStr = $_GET["echostr"];

if($this->checkSignature()) {

echo $echoStr;

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;

}

}

//相应消息

public function responseMsg($value='')

{

//1.先接受微信服务器转发过来的信息

$xmlStr = file_get_contents("php://input");

//2.将第一步的xml字符串转化为对象

$xmlObj = simplexml_load_string($xmlStr, “SimpleXMLElement”, LIBXML_NOCDATA );

//3.判断消息的类型

switch ($xmlObj->MsgType) {

case 'text':

//粉丝发送的是文本消息

$result = $this->receiveTextMsg($xmlObj);

break;

case 'image':

//粉丝发送的是图片消息

break;

default:

//不能识别上述消息类型

break;

}

//响应结果

echo $result;

}

//接受并处理粉丝发送的消息

//$xmlobj 接受到的XML对象信息

public function receiveTextMsg($xmlObj)

{

//获取粉丝发送的内容

$keyword = trim($xmlObj->Content);

//响应内容给粉丝

$content = "你发送的内容是:".$keyword;

//拼接xml数据包

$result = $this->transitTextXML($xmlObj,$content);

}

//拼接xml数据包

public function transitTextXML($xmlObj,$content)

{

//通过占位符来表示变量

$tmpStr = '

%s

';

//格式化输出

$result = sprintf($tmpStr,$xmlObj->FromUserName,$xmlObj->ToUserName,time(),$content);

return $result;

}

}

?>