<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    public function index(){
    //获得参数 signature  nance  token  timestamp echostr
        $nonce = $_GET['nonce'];
        $token = 'cyts';
        $timestamp = $_GET['timestamp'];
        $echostr = $_GET['echostr'];
        $signature = $_GET['signature'];
        //形成数组然后用字典排序
        $array = array($nonce,$token,$timestamp);
        sort($array);

        //拼接字符串,加密,然后与sigature进行校验
        $str = sha1(implode($array));

        if ($str == $signature && $echostr) {
            //第一次介入weixin API接口的时候验证
             echo $echostr;
             exit;
        }else{
            $this->reponseMsg();
        }
    }
    //接收时间推送并回复
    public function reponseMsg(){
        //1.获取到微信推送过来POST数据(xml格式)
        $postArr = $GLOBALS['HTTP_RAW_POST_DATA'];
        //2处理消息类型,并设置回复类型和内容
        // <xml>
        // <ToUserName><![CDATA[toUser]]></ToUserName>
        // <FromUserName><![CDATA[FromUser]]></FromUserName>
        // <CreateTime>123456789</CreateTime>
        // <MsgType><![CDATA[event]]></MsgType>
        // <Event><![CDATA[subscribe]]></Event>
        // </xml>    

        // $postObj = simplexml_load_string($postar);
        // $postObj->ToUseName = '';
        // $postObj->FromUserName = '';
        // $postObj->CreateTime = '';
        // $postObj->MsgType = '';
        // $postObj->Event = '';

        //判断该数据包是否是订阅的事件推送
        if(strtolower($postObj->MsgType) == 'event'){
            //如果是关注subscribe事件
            if (strtolower($postObj->Event == 'subscribe') ){
                //回复用户消息
                $toUser   = $postObj->FromUserName;
                $fromUser = $postObj->ToUserName;
                $time     = time();
                $msgType  = 'text';
                $content  = '欢迎关注我的微信公众账号';
                file_put_contents('1.php', $content);
                $template = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            </xml>";
                $info     = sprintf($template,$toUser,$fromUser,$time,$msgType,$content);
               echo $info;

            }
        }      
    }
    
}