advertising/application/controllers/Weixin.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Weixin extends MY_Controller {

	private $_TOKEN = "weixin";
	public function __construct()
    {
        parent::__construct();
		//$this->load->model('admin/Weixin_model');
    }

	public function response()
	{
		if (!isset($_GET['echostr'])) {
			$this->responseMsg();
		}else{
			$this->valid();
		}
	}

	public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

	public function getCode()
	{
		$code = $_GET['code'];
		$uinfo=file_get_contents("https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx6b7982f5a2a2d161&secret=c33fc8c2c5658ad76a04afe1fa1808dd&code={$code}&grant_type=authorization_code");
		$uinfo=(array)json_decode($uinfo);
		$openid=$uinfo['openid'];
		echo "OPENID IS: ".$openid;
	}

    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];

        $token = $this->_TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }

    public function responseMsg()
    {
        //$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
		$postStr = file_get_contents("php://input");
        if (!empty($postStr))
		{
			/*$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $fromUsername = $postObj->FromUserName;
            $toUsername = $postObj->ToUserName;
            $keyword = trim($postObj->Content);
            $time = time();
            $textTpl = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[%s]]></MsgType>
                        <Content><![CDATA[%s]]></Content>
                        <FuncFlag>0</FuncFlag>
                        </xml>";
            if($keyword == "?" || $keyword == "？")
            {
                $msgType = "text";
                $contentStr = $postObj->FromUserName;
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
            }*/
			
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "text":
                    $resultStr = $this->receiveText($postObj);
                    break;
                case "event":
                    $resultStr = $this->receiveEvent($postObj);
                    break;
                default:
                    $resultStr = "";
                    break;
            }
            echo $resultStr;
			
        }else {
            echo "";
            exit;
        }
    }

    private function receiveText($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的内容为：".$object->Content;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }
    
    private function receiveEvent($object)
	{
		$content = "";
		switch ($object->Event)
		{
			case "CLICK":
				switch ($object->EventKey)
				{
					case "haoya":
						$content[] = array("Title"=>"OpenID", "Description"=>"你的OpenID为：".$object->FromUserName, "PicUrl"=>"", "Url" =>"www.163.com");
						//header('Location: http://www.163.com/');
						break;
				}
				break;
		}
		if(is_array($content)){
			$result = $this->transmitNews($object, $content);
		}else{
			$result = $this->transmitText($object, $content);
		}
		return $result;
	}

    private function transmitText($object, $content, $funcFlag = 0)
    {
        $textTpl = "<xml>
		<ToUserName><![CDATA[%s]]></ToUserName>
		<FromUserName><![CDATA[%s]]></FromUserName>
		<CreateTime>%s</CreateTime>
		<MsgType><![CDATA[text]]></MsgType>
		<Content><![CDATA[%s]]></Content>
		<FuncFlag>%d</FuncFlag>
		</xml>";
        $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content, $funcFlag);
        return $resultStr;
    }

    private function transmitNews($object, $arr_item, $funcFlag = 0)
    {
        //首条标题28字，其他标题39字
        if(!is_array($arr_item))
            return;

        $itemTpl = "    <item>
				<Title><![CDATA[%s]]></Title>
				<Description><![CDATA[%s]]></Description>
				<PicUrl><![CDATA[%s]]></PicUrl>
				<Url><![CDATA[%s]]></Url>
			</item>
		";
        $item_str = "";
        foreach ($arr_item as $item)
            $item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);

        $newsTpl = "<xml>
		<ToUserName><![CDATA[%s]]></ToUserName>
		<FromUserName><![CDATA[%s]]></FromUserName>
		<CreateTime>%s</CreateTime>
		<MsgType><![CDATA[news]]></MsgType>
		<Content><![CDATA[]]></Content>
		<ArticleCount>%s</ArticleCount>
		<Articles>
		$item_str</Articles>
		<FuncFlag>%s</FuncFlag>
		</xml>";

        $resultStr = sprintf($newsTpl, $object->FromUserName, $object->ToUserName, time(), count($arr_item), $funcFlag);
        return $resultStr;
    }
}