微信开发绑定事件实现机制

define("TOKEN", "Your Token");

$test = new TestController();
$test->bind('subscribe');
$test->trigger();



class TestController{
    
    public $wechat = null;
    
    public function __construct(){
        
        $this->wechat = new Wechat();

    }
    
    
    public function bind($event, $method=''){
        $this->wechat->bind($event, $method);
    }
    
    public function trigger(){
        $this->wechat->trigger($this);
    }
    
    public function onSubscribe(){
        
            $request = $this->wechat->request;
            $fromUsername = $request->FromUserName;
            $toUsername = $request->ToUserName;
            $msgType = 'news';
            
            $xml = $this->wechat->setXmlHeader($fromUsername, $toUsername, $msgType);
            
            $content = '<ArticleCount>1</ArticleCount>
                            <Articles>
                                <item>
                                    <Title><![CDATA[欢迎订阅]]></Title> 
                                    <Description><![CDATA[hehehe]]></Description>
                                    <PicUrl><![CDATA[http://pic.58pic.com/58pic/11/88/62/74h58PICNWd.jpg]]></PicUrl>
                                    <Url><![CDATA[http://www.baidu.com]]></Url>
                                </item>
                            </Articles>'; 
                            
            $this->wechat->dispaly($xml, $content);
        
    }
    
    
    public function response(){
        
        $this->test();
    }
    
    
    public function test(){
        
        if($this->wechat->request->Content != ''){
            
            if(preg_match('/你是/', $this->wechat->request->Content)){
                $this->wechat->p('我是你大哥呀!!!');
            }
            
            $this->wechat->p('您发送了一条消息');
        }
        
    }
    
}







class Wechat{
    
    public $event = '';
    public $bind = [];
    public $request = null;

    public function __construct(){
        
        if(isset($_GET['echostr'])) $this->valid();
        $this->request = $this->getRequest();

    }
    
    public function valid(){
        
        $echoStr = $_GET["echostr"];
        if($this->__checkSignature()){
            echo $echoStr; exit;
        }
    }
    
    public function bind($event, $method=''){
        
        if(empty($method)) $method = "on" . ucfirst($event);
        $this->bind[$event] = $method;
        
    }
    
    public function trigger($object){
        
        $method = isset($this->bind[$this->event])? $this->bind[$this->event] : 'response';
        call_user_func_array([$object, $method], []);
        
    }

    public function getRequest(){
        
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if(!empty($postStr)){
                libxml_disable_entity_loader(true);
                  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $postObj->Content = trim($postObj->Content);
                $postObj->getTime = time();
                if($postObj->MsgType == 'event') $this->event = (string) $postObj->Event;
                
        }else{
            return null;
        }
        return $postObj;
        
    }
    

    
    public function setXmlHeader($fromUsername, $toUsername, $msgType){
        
        $xml = '<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[%s]]></MsgType>
                {{__content__}}
                </xml>';
                
        $time = time();
        return sprintf($xml, $fromUsername, $toUsername, $time, $msgType);    
        
    }
    

    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;
        }
        
    }
    
    
    //调试方法
    public function p($content){

        $postObj = $this->request;
        $fromUsername = $postObj->FromUserName;
        $toUsername = $postObj->ToUserName;
        $textTpl = "<xml>
                    <ToUserName><![CDATA[%s]]></ToUserName>
                    <FromUserName><![CDATA[%s]]></FromUserName>
                    <CreateTime>%s</CreateTime>
                    <MsgType><![CDATA[%s]]></MsgType>
                    <Content><![CDATA[%s]]></Content>
                    <FuncFlag>0</FuncFlag>
                    </xml>";             
        $msgType = "text";
        if(!is_scalar($content)) $content = var_export($content, true);
        if(empty($content)) $content = 'empty';
        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, time(), $msgType, $content);
        echo $resultStr;
        exit;        
        
    }
    
    public function dispaly($xml, $content){
        
        $xml = str_replace('{{__content__}}', $content, $xml);
        exit($xml);
    }
    
    
}