首先在微信公众平台(网址：https://mp.weixin.qq.com)申请一个订阅号，然后在开发里找到开发者工具点击公众平台测试账号，在测试账号内进行微信开发实验。    1. 设置一个自己的有效的域名网址和TOKEN(就是暗号)，TOKEN一定要与PHP代码中的TOKEN验证一致否则会一直配置失败(写有这段代码的文件一定要传到有效的域名网址内。与设置的网址必须相同)。    下面是PHP代码(在微信公众平台开发里的开发者文档内有部分代码) 。

//define your token

define("TOKEN", "weixin");

$wechatObj = new wechatCallbackapiTest();

$wechatObj->run();

class wechatCallbackapiTest

{

public function run()

{

if ($this->checkSignature()==false) {

die('非法请求');

}

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

$echostr = $_GET["echostr"];

echo $echostr;

exit();

} else {

$this->responseMsg();

}

/*$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 = "

%s

0

";

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);

$tmpStr = implode( $tmpArr );

$tmpStr = sha1( $tmpStr );

if( $tmpStr == $signature ){

return true;

}else{

return false;

}

}

}

?>

2.自动回复 首先重新写一个方法在上面那个文件夹里，再调用此方法，注意不能重名。以下代码是给订阅号发天气，它会回复天气晴朗，发放假，它会回复你“不好好奋斗瞎想啥？”回复其他则会回复"Welcome to wechat world!"public function responseMsg()

{

//get post data, May be due to the different environments

$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

file_put_contents('msg.txt', $postStr,FILE_APPEND);

//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();

//$msgType = $postObj->MsgType;//消息类型

//$event = $postObj->Event;//时间类型，subscribe(订阅)、unsubscribe(取消订阅)

$textTpl = "

%s

0

";

if(!empty( $keyword ))

{

$msgType = "text";

$contentStr = $this->autohuifu($keyword);

//$contentStr = "Welcome to wechat world!";

$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);

echo $resultStr;

}else{

echo "Input something...";

}

}else {

echo "";

exit;

}

}

public function autohuifu($keyword){

if($keyword =='天气'){

$contentStr = "天气晴朗";

}else if($keyword =='放假'){

$contentStr = "成天不好好奋斗瞎想啥？";

}else{

$contentStr = "Welcome to wechat world!";

}

return $contentStr;