[PHP知识库]PHP微信公众号开发入门

1. 申请云主机、域名，配置PHP运行环境，公网可顺利访问
2. 申请微信公众号（本文指订阅号）
3. 登录公众平台
4. 基本配置
5. 下载官方范例
6. 修改代码

7. <?php
   include_once "WXBizMsgCrypt.php";
   $encodingAesKey = "在公众号设置中指定";
   $token = "在公众号设置中指定";
   define('TOKEN', $token);
   $AppId="在公众号设置中指定";
   
   header("Content-Type:text/html; charset=utf-8");
   
   if(is_array($_GET)&&count($_GET)>0){
       $signature = $_GET["signature"];
       $timestamp = $_GET["timestamp"];
       $nonce = $_GET["nonce"];
   	if ($_GET['echostr']){
   	    $token = TOKEN;
           $tmpArr = array($token, $timestamp, $nonce);
           sort($tmpArr, SORT_STRING);
           $tmpStr = implode( $tmpArr );
           $tmpStr = sha1( $tmpStr );
           if( $tmpStr == $signature ){
               echo($_GET['echostr']);
           }else{
               print("ERR: " . $errCode . "\n\n");
           }
       	exit;
   	}
       $sReqMsgSig = $sVerifyMsgSig = $_GET['msg_signature'];  
   	$sReqTimeStamp = $sVerifyTimeStamp = $_GET['timestamp'];  
   	$sReqNonce = $sVerifyNonce = $_GET['nonce'];  
       $sMsg = ""; 
   	$wxcpt = new WXBizMsgCrypt($token, $encodingAesKey, $AppId);
   	$errCode = $wxcpt->DecryptMsg($sReqMsgSig, $sReqTimeStamp, $sReqNonce, $sReqData, $sMsg);  
       if ($errCode == 0) {
   		$xml = new DOMDocument();  
   		$xml->loadXML($sMsg);   
   		$reqToUserName = $xml->getElementsByTagName('ToUserName')->item(0)->nodeValue;  
   		$reqFromUserName = $xml->getElementsByTagName('FromUserName')->item(0)->nodeValue;  
   		$reqCreateTime = $xml->getElementsByTagName('CreateTime')->item(0)->nodeValue;  
   		$reqMsgType = $xml->getElementsByTagName('MsgType')->item(0)->nodeValue;  
   		$reqContent = $xml->getElementsByTagName('Content')->item(0)->nodeValue;  
   		$reqMsgId = $xml->getElementsByTagName('MsgId')->item(0)->nodeValue;  
   		$reqAgentID = $xml->getElementsByTagName('AgentID')->item(0)->nodeValue;
   		if ($reqMsgType!="text"){
   			exit;
   		}
           
           $mycontent=$reqContent;
           $timestamp = $_GET['timestamp'];
           $nonce = $_GET['nonce'];
           $toUser   = $reqFromUserName;
           $fromUser = $reqToUserName;
           $respondMsg =  '<xml><ToUserName><![CDATA['.$toUser.']]></ToUserName><FromUserName><![CDATA['.$fromUser.']]></FromUserName><CreateTime>'.time().'</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA['.$mycontent.']]></Content></xml>';
               //输出未加密消息
               // echo $respondMsg;
               // exit();
           //输出未加密消息
           $pc = new WXBizMsgCrypt($token, $encodingAesKey, $AppId);
           $encryptMsg = '';
           $errCode = $pc->encryptMsg($respondMsg, $timestamp, $nonce, $encryptMsg);
           echo $encryptMsg;
           exit;
   }

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