CI framework WeChat web page authorization library

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');	
	Class Coupon_index extends CI_Controller
	{
		function __construct()
		{
			parent::__construct();
			$this->load->library(array('weixin','session'));
            $this->load->helper('url');
			// $this->load->ldap_mod_del(link_identifier, dn, entry)
            $this->load->model('Coupon_model');
           
		}
	    /**
		 *优惠券主程序
		 */
		function index()
		{
			$this->load->view('/coupon/index.html');
		}

        function User_exists()
        {
           /*
                检测改微信用户是否存在
                $user_arr 获取的是通过get_code返回的微信用户信息，此时的信息是通过微信服务器返回的，不能记录session
                $user std_obj模式，转换为数组
                $user_exists 扔入model中，检测数据表中是否存在该用户
                $redirect 走完流程后，跳转到首页
                if语句的作用，是 判断通过model返回数据表的信息，如果为空则把微信用户信息录入到表中，再读取出来，存进session。
                else 则数据表已经存在该用户，直接读取，存进session
                需要注意的是，使用foreach的原因，是二维数组转一维数组
           */
                $user_arr = $this->Get_code();
                // var_dump($user_arr);exit();
                $user = $this->weixin->obj_to_arr($user_arr);
                // var_dump($user);exit();
                // print_r($user);exit();

                $user_exists = $this->Coupon_model->CheckUser('cou_user',$user);
                // print_r($user_exists);exit();
                // $redirect = 'http://h5.imchaotan.com/coupon/index.php/Coupon/Coupon_index/Coupon_Get/bid/1';
                // $return_url = $this->session->return_url;
                $redirect = 'http://h5.imchaotan.com'.$this->session->return_url;
                // echo $redirect;exit();
                if(empty($user_exists))
                {
                     /*
                  由于微信获取到的用户数据是stdclass对象格式
                  所以需要进行转换成数组 使用 obj_to_arr方式
                 */

                //加入自定义的字符进入数组
                unset($user['privilege']);
                $user_exists['nickname']      = $user['nickname'];
                $user_exists['openid']        = $user['openid'];
                $user_exists['language']      = $user['language'];
                $user_exists['city']          = $user['city'];
                $user_exists['country']       = $user['country'];
                $user_exists['province']      = $user['province'];
                $user_exists['headimgurl']    = $user['headimgurl'];
                $user_exists['sex']           = $user['sex'];
                $user_exists['fullname']      = $user['nickname'];
                $user_exists['telphone']      = '';
                $user_exists['login_ip']      =$this->input->ip_address();
                $user_exists['last_ip']       =$this->input->ip_address();
                $user_exists['groups']        = REGISTER_GROUP_ID;
                $user_exists['status']        = 1; 
                $user_exists['login_time']    = date("Y-m-d");

                 $insert_id = $this->Coupon_model->insert_one('cou_user',$user_exists);
                $user_exists['uid'] = $insert_id;
                }
                else{
                  $user_exists = $user_exists[0];
                }
                
                // $return_url = $this->session->back_url;
                // if(isset($return_url))header('location:'.$return_url);

                /*由Coupon_idex中的Get_Coupon处理*/
                $this->session->set_userdata($user_exists);
                if(isset($this->session->return_url))header('location:'.$this->session->return_url);
                // print_r($user_exists);exit();
                header('location:'.$redirect);


        }

		function Coupon_start()
		{
			/*进入领取页面，需要先经过授权*/
            $redirect_url = 'Coupon/Coupon_index/User_exists';
            $redirect = urlencode('http://h5.imchaotan.com/coupon/index.php/'.$redirect_url);
            // $redirect = urlencode('http://h5.imchaotan.com/coupon/index.php/Coupon/Coupon_index/Get_code');
            $return = $this->weixin->redirect_url($redirect);
             header('location:'.$return);
		}

        public function Get_code()
        {
            if(isset($_GET['code']))
            {
                $code = $_GET['code'];
                // echo $code;exit();
                $user_arr = $this->weixin->access_token($code);
                //跳转到用户检测中check_exists()去
               // echo $user_arr;exit();
                // var_dump($user_arr);
                
                return $user_arr;
                
            }else{
                //否则检测cookie中是否存在该用户，如果有，则return回首页
                    echo 'error';
            }
         }

         public function Coupon_Get()
         {
            
            /*获取商家bid，读取相关信息*/
            // $b_name = $this->uri->segment(4, 0);
           
            $nickname = $this->session->nickname;
            $openid = $this->session->openid;
            $status = $this->session->status;
            $_SESSION['return_url'] =  $_SERVER['REQUEST_URI'];
            // $this->session->set_userdata($return_url);
            // echo $this->session->return_url;exit();
            if(empty($nickname))header('location:'.'http://h5.imchaotan.com/coupon/index.php/Coupon/Coupon_index/Coupon_start');
            $bid = $this->uri->segment(5, 0);
            /*扔进Coupon_model中，读取bid中的商家信息*/
            $content = $this->Coupon_model->Coupon_Business('cou_business',$bid);

            // print_r($content);
            // echo $bid;
            // echo $b_name;
            $data['bname']      = $content['bname'];
            $data['discount']   = $content['discount'];
            $data['bimg']       = $content['bimg'];
            $data['contents']   = $content['contents'];
            $data['amount']     = $content['amount'];
            $data['nickname']   = $nickname;
            $data['status']     = $status;
            $data['js'] = json_encode(array($content['bname'],$content['discount'],$nickname,$status));
            // echo $data['js'];exit();
            // print_r($data);
            $this->load->view('/coupon/index.html',$data);
            // echo $nickname;
            // echo $status;

         
        }
       
}