php如何实现微信公众号开发之文本消息自动回复

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具体内容如下

1.PHP示例代码下载
下载地址1：http://xiazai.jb51.net/201608/yuanma/phpwx(jb51.net).rar
下载地址2：https://mp.weixin.qq.com/wiki/home/index.html（开始开发-》接入指南-》PHP示例代码下载）

2.wx_sample.php初始代码

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)){ /* 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 = "      %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() { // you must define TOKEN by yourself if (!defined("TOKEN")) { throw new Exception('TOKEN is not defined!'); }  $signature = $_GET["signature"]; $timestamp = $_GET["timestamp"]; $nonce = $_GET["nonce"];  $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; } }}?>

3.调用回复信息方法
在wx_sample.php文件中注释掉$wechatObj->valid();，在其下增加一句"$wechatObj->responseMsg();"。

valid();//接口验证$wechatObj->responseMsg();//调用回复消息方法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)){ /* 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 = "      %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() { // you must define TOKEN by yourself if (!defined("TOKEN")) { throw new Exception('TOKEN is not defined!'); }  $signature = $_GET["signature"]; $timestamp = $_GET["timestamp"]; $nonce = $_GET["nonce"];  $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; } }}?>

4.关键词自动回复和关注回复
$keyword保存着用户微信端发来的文本信息。
官方开发者文档：https://mp.weixin.qq.com/wiki/home/index.html（消息管理-》接收消息-接收事件推送-》1.关注/取消关注事件）

关注事件与一般的文本消息有两处不同，一是MsgType值是event，二是增加了Event值是subscribe。由于官方文档（最初的wx_sample.php）没有提取这个参数，需要我们自己提取。在程序中增加两个变量$msgType和$event。

valid();//接口验证$wechatObj->responseMsg();//调用回复消息方法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)){ /* 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(); $msgType = $postObj->MsgType;//消息类型 $event = $postObj->Event;//时间类型，subscribe（订阅）、unsubscribe（取消订阅） $textTpl = "      %s      0  ";    switch($msgType){  case "event":  if($event=="subscribe"){  $contentStr = "Hi,欢迎关注海仙日用百货!"."\n"."回复数字'1',了解店铺地址."."\n"."回复数字'2',了解商品种类.";  }   break;  case "text":  switch($keyword){  case "1":  $contentStr = "店铺地址："."\n"."杭州市江干艮山西路233号新东升市场地下室第一排.";   break;  case "2":  $contentStr = "商品种类:"."\n"."杯子、碗、棉签、水桶、垃圾桶、洗碗巾(刷)、拖把、扫把、"   ."衣架、粘钩、牙签、垃圾袋、保鲜袋(膜)、剪刀、水果刀、饭盒等.";  break;  default:  $contentStr = "对不起,你的内容我会稍后回复";  }  break; } $msgType = "text"; $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr); echo $resultStr; }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"]; $timestamp = $_GET["timestamp"]; $nonce = $_GET["nonce"];  $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; } }}?>

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