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CodeIgniter 框架整合微信網頁授權完整實作指南

編輯：PHP 綜合知識

前言

微信網頁授權是開發微信公眾號應用的基礎功能，本文將詳細介紹如何在 CodeIgniter (CI) 框架中封裝並使用微信網頁授權庫，實現靜默授權與用戶信息獲取的完整流程。

核心類庫封裝

首先在 application/libraries 目錄下建立 Weixin.php，封裝授權跳轉、Access Token 換取、用戶信息獲取等核心邏輯：

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

class Weixin {
    private $appId;
    private $appSecret;

    public function __construct() {
        $this->appId = trim('你的 AppID');
        $this->appSecret = trim('你的 AppSecret');
    }

    /** 生成授權跳轉 URL */
    public function redirect_url($redirect) {
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->appId}&redirect_uri={$redirect}&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
        return $url;
    }

    /** 通過 code 換取 access_token 並獲取用戶信息 */
    public function access_token($code) {
        $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->appId}&secret={$this->appSecret}&code={$code}&grant_type=authorization_code";
        $result = $this->postdata($token_url);
        $access_token = $result['access_token'];
        $openid = $result['openid'];

        $user_url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$openid}&lang=zh_CN";
        $userinfo = json_decode(file_get_contents($user_url));
        return $userinfo;
    }

    /** 檢測 access_token 有效性 */
    public function eff($access_token, $openid) {
        $url = "https://api.weixin.qq.com/sns/auth?access_token={$access_token}&openid={$openid}";
        return json_decode(file_get_contents($url));
    }

    /** CURL 獲取遠程數據 */
    private function postdata($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return json_decode($output, true);
    }

    /** 將對象轉為數組 */
    public function obj_to_arr($data) {
        $data = is_object($data) ? get_object_vars($data) : $data;
        foreach ($data as $key => $value) {
            $arr[$key] = $value;
        }
        return $arr;
    }

    /** 寫入 Session */
    public function save_session($data) {
        foreach ($data as $key => $value) {
            $_SESSION[$key] = $value;
        }
        return $_SESSION;
    }
}

控制器實現業務邏輯

在 Coupon_index 控制器中串聯授權流程：

<?php
class Coupon_index extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->library(array('weixin', 'session'));
        $this->load->helper('url');
        $this->load->model('Coupon_model');
    }

    /** 入口：發起授權 */
    public function Coupon_start() {
        $redirect_url = 'Coupon/Coupon_index/User_exists';
        $redirect = urlencode('https://yourdomain.com/coupon/index.php/' . $redirect_url);
        header('Location: ' . $this->weixin->redirect_url($redirect));
    }

    /** 微信回調：獲取 code 並換取用戶信息 */
    public function Get_code() {
        if (isset($_GET['code'])) {
            $code = $_GET['code'];
            return $this->weixin->access_token($code);
        }
        echo 'error';
    }

    /** 用戶存在性檢測與 Session 寫入 */
    public function User_exists() {
        $user_arr = $this->Get_code();
        $user = $this->weixin->obj_to_arr($user_arr);
        $user_exists = $this->Coupon_model->CheckUser('cou_user', $user);

        if (empty($user_exists)) {
            // 新用戶入庫
            unset($user['privilege']);
            $user['fullname'] = $user['nickname'];
            $user['telphone'] = '';
            $user['login_ip'] = $this->input->ip_address();
            $user['last_ip'] = $this->input->ip_address();
            $user['groups'] = REGISTER_GROUP_ID;
            $user['status'] = 1;
            $user['login_time'] = date("Y-m-d");
            $insert_id = $this->Coupon_model->insert_one('cou_user', $user);
            $user['uid'] = $insert_id;
        } else {
            $user = $user_exists[0];
        }

        $this->session->set_userdata($user);
        $redirect = $this->session->return_url ?? 'https://yourdomain.com/coupon/index.php/Coupon/Coupon_index/index';
        header('Location: ' . $redirect);
    }

    /** 優惠券領取頁面 */
    public function Coupon_Get() {
        $nickname = $this->session->nickname;
        if (empty($nickname)) {
            header('Location: ' . site_url('Coupon/Coupon_index/Coupon_start'));
            return;
        }
        $bid = $this->uri->segment(5, 0);
        $content = $this->Coupon_model->Coupon_Business('cou_business', $bid);
        $data = array_merge($content, [
            'nickname' => $nickname,
            'status' => $this->session->status,
            'js' => json_encode([$content['bname'], $content['discount'], $nickname, $this->session->status])
        ]);
        $this->load->view('/coupon/index.html', $data);
    }
}