Pitfalls encountered in the automatic reply of WeChat messages in PHP WeChat development, automatic reply of WeChat drift bottle, complete collection of WeChat automatic reply, automatic reply of WeChat group

WeChat reply principle:

When an ordinary WeChat user sends a message to a public account, the WeChat server first receives the message sent by the user;

Then the user information and message are packaged into a data packet in XML format, and then this XML The data package is submitted to the URL set by the developer through the POST method.

Question 1: Why use $GLOBALS["HTTP_RAW_POST_DATA"] to save the POST data instead of the $_POST array?

Answer:

POST can only save standard data types, and cannot parse content such as XML, SOAP or Application/Octet-steam.

And $GLOBALS["HTTP_RAW_POST_DATA"] is the same as $_POST. If PHP can recognize the POST data, you can use $GLOBALS["HTTP_RAW_POST_DATA"] to receive it.

Question 2: What are the parameters and return values ​​of simplexml_load_file()?

Answer:

Parameter meaning

string: XML string that needs to be processed.

class: used to specify a new object, usually set to "SimpleXMLElement" to generate a class of simple XML elements.

options: Specify additional Libxml parameters, usually set to the constant LIBXML_NOCDATA, which means setting CDATA as a text node.

ns: Generally omitted

is_prefix: Generally omitted

Returns an object of the SimpleXMLElement class after the function is executed.

Function: The official account only accepts text messages and makes corresponding text replies.

<span>valid(); 
class Wechat{ 
public function valid(){ 
$echoStr = $_GET['echostr']; 
//如果是第一次接入 
if($this->checkSignature() && $echoStr ){ 
echo $echoStr; 
exit; 
}else{ 
$this->responseMsg(); 
} 
} 
//校验方法 
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; 
} 
} 
/* 普通文本消息 
<xml> 
<tousername></tousername> 
<fromusername></fromusername> 
<createtime>1348831860</createtime> 
<msgtype></msgtype> 
<content></content> 
</xml> 
*/ 
public function responseMsg(){ 
//获取微信服务器POST请求中的数据 
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; 
if( !empty($postStr) ){ 
$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA); 
$fromUser = $postObj->FromUserName; 
$toUser = $postObj->ToUserName; 
$keyword = trim($postObj->Content); 
$time = time(); 
$template = "<xml> 
<tousername></tousername> 
<fromusername></fromusername> 
<createtime>%s</createtime> 
<msgtype></msgtype> 
<content></content> 
</xml>"; 
if( strtolower($postObj->MsgType)!='text' ){ 
$msgType = "text"; 
$content = "我只接受文本消息"; 
}else{ 
$msgType = "text"; 
if( !empty($keyword) ){ 
$content = "您发送的消息是：".$postObj->Content; 
}else{ 
$content = "请输入关键字";//消息为空 
} 
} 
$info = sprintf($template, $fromUser, $toUser, $time, $msgType, $content); 
echo $info; 
}else{ 
echo ""; 
exit; 
} 
} 
}</span> 

Function: The official account only accepts picture messages and makes corresponding text replies.

<span>valid(); 
class Wechat{ 
public function valid(){ 
$echoStr = $_GET['echostr']; 
//如果是第一次接入 
if($this->checkSignature() && $echoStr ){ 
echo $echoStr; 
exit; 
}else{ 
$this->responseMsg(); 
} 
} 
//校验方法 
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; 
} 
} 
/* 接收图片消息格式 
<xml> 
<tousername></tousername> 
<fromusername></fromusername> 
<createtime>1348831860</createtime> 
<msgtype></msgtype> 
<picurl></picurl> 
<mediaid></mediaid> 
<msgid>1234567890123456</msgid> 
</xml> 
*/ 
public function responseMsg(){ 
//获取微信服务器POST请求中的数据 
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; 
if( !empty($postStr) ){ 
$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA); 
$fromUser = $postObj->FromUserName; 
$toUser = $postObj->ToUserName; 
$time = time(); 
$msgType= $postObj->MsgType; 
$picUrl = $postObj->PicUrl; 
$mediaId = $postObj->MediaId; 
$template = "<xml> 
<tousername></tousername> 
<fromusername></fromusername> 
<createtime>%s</createtime> 
<msgtype></msgtype> 
<content></content> 
</xml>"; 
if( strtolower($msgType)!='image' ){ 
$msgType = "text"; 
$content = "我只接受图片消息"; 
}else{ 
$msgType = "text"; 
if( !empty( $picUrl ) ){ 
$content = "图片链接为:".$picUrl."\n"; 
$content .= "媒体id:".$mediaId; 
}else{ 
$content = "请发送图片";//消息为空 
} 
} 
$info = sprintf($template, $fromUser, $toUser, $time, $msgType, $content); 
echo $info; 
}else{ 
echo ""; 
exit; 
} 
} 
}</span>

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