PHP實例
<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');
Class Weixin
{
    private $appId;
    private $appSecret;
    function __construct()
    {
      $this->appId = trim('你的appid');
      $this->appSecret = trim('你的appsecret');
    }
    function redirect_url($redirect)
    {
      /*授權頁面*/
      $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=$this->appId&redirect_uri=$redirect&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
      return $url;
    }
    /* 通過code換取access_token*/
    function access_token($code)
    {
      /*獲取到的code換取access_token和openid*/
      $post_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$this->appId&secret=$this->appSecret&code=$code&grant_type=authorization_code";
             // echo $post_url;exit();
      $return = $this->postdata($post_url);
      // print_r($return);exit();
      $access_token = $return['access_token'];
      $openid = $return['openid'];
      /*獲取微信用戶數據*/
      $get_userinfo = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
      $userinfo = json_decode(file_get_contents($get_userinfo));
      return $userinfo;
    }
    function eff($access_token,$openid)
    {
      /*檢測access_token是否正確,errcode＝0 為正確*/
      $eff_url = "https://api.weixin.qq.com/sns/auth?access_token=$access_token&openid=$openid";
      $get_eff =json_decode(file_get_contents($eff_url));
      return $get_eff;
    }
    //通過curl方式提交code換取access_token數據
    function postdata($url)
    {
       header('Content-Type:text/html;charset=utf-8');
       // echo $url;exit();
      $curl = curl_init();
      curl_setopt($curl, CURLOPT_URL, $url);
      curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
      curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
      curl_setopt($curl, CURLOPT_SSLVERSION, 1);
      // if (!empty($data)){
        // curl_setopt($curl, CURLOPT_POST, 1);
        // curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
      // }
      curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
      $output = curl_exec($curl);
      curl_close($curl);
      // var_dump($output);exit();
      // print_r($output);exit();
      $access = json_decode($output,true);
      return $access;
    }
    /*
      這個位置開始是控制器index()傳入的微信用戶資料處理
    */
      function save_session($data)
      {
        foreach ($data as $key => $value) {
          // $_SESSION['uid'] = $value['uid'];
          // $_SESSION['nickname'] = $value['nickname'];
          // $_SESSION['fullname'] = $value['fullname'];
          // $_SESSION['status'] = $value['status'];
          // $_SESSION['groups'] = $value['groups'];
          $_SESSION[$key] = $value;
        }
        return $_SESSION;
        // print_r($_SESSION);exit();
        // unset($_SESSION[0]);
      }
    function obj_to_arr($data)
    {
      // 進行轉換成數組 使用 obj_to_arr方式
      $data = is_object($data)?get_object_vars($data):$data;
        foreach ($data as $key => $value)
        {
          $arr[$key] = $value;
        }
        return $arr;
    }
}

PHP實例
<?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');
    }
    /**
     *優惠券主程序
     */
    function index()
    {
      $this->load->view('/coupon/index.html');
    }
    function User_exists()
    {
      /*
        檢測改微信用戶是否存在
        $user_arr 獲取的是通過get_code返回的微信用戶信息,此時的信息是通過微信服務器返回的,不能記錄session
        $user std_obj模式,轉換為數組
        $user_exists 扔入model中,檢測數據表中是否存在該用戶
        $redirect 走完流程后,跳轉到首頁
        if語句的作用,是 判斷通過model返回數據表的信息,如果為空則把微信用戶信息錄入到表中,再讀取出來,存進session.
        else 則數據表已經存在該用戶,直接讀取,存進session
        需要注意的是,使用foreach的原因,是二維數組轉一維數組
      */
        $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://yourwebname.com/coupon/index.php/Coupon/Coupon_index/Coupon_Get/bid/1';
        // $return_url = $this->session->return_url;
        $redirect = 'http://yourwebname.com'.$this->session->return_url;
        // echo $redirect;exit();
        if(empty($user_exists))
        {
           /*
         由于微信獲取到的用戶數據是stdclass對象格式
         所以需要進行轉換成數組 使用 obj_to_arr方式
         */
        //加入自定義的字符進入數組
        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處理*/
        $this->session->set_userdata($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()
    {
      /*進入領取頁面,需要先經過授權*/
      $redirect_url = 'Coupon/Coupon_index/User_exists';
      $redirect = urlencode('http://yourwebname.com/coupon/index.php/'.$redirect_url);
      // $redirect = urlencode('http://yourwebname.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);
        //跳轉到用戶檢測中check_exists()去
        // echo $user_arr;exit();
        // var_dump($user_arr);
        return $user_arr;
      }else{
        //否則檢測cookie中是否存在該用戶,如果有,則return回首頁
          echo 'error';
      }
     }
     public function Coupon_Get()
     {
      /*獲取商家bid,讀取相關信息*/
      // $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://yourwebname.com/coupon/index.php/Coupon/Coupon_index/Coupon_start');
      $bid = $this->uri->segment(5, 0);
      /*扔進Coupon_model中,讀取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;
    }
}