Codeigniter使用Easywechat组件

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原创内容，转载请注明出处：https://phpsoho.com/publish/article/34 在【Codeigniter添加Composer支持】中，讲过了如何在Codeigniter添加Composer支持，本篇文章讲一下如何使用第三方package包。

通过Composer安装Easywechat
进入项目根目录，执行：

1. litou$composer require overtrue/wechat
   
2. Using version ^3.1 for overtrue/wechat
   
3. ./composer.json has been updated
   
4. Loading composer repositories with package information
   
5. Updating dependencies (including require-dev)
   
6.   - Installing symfony/polyfill-mbstring (v1.2.0)
   
7.     Loading from cache
   
8. 
   
9.   - Installing symfony/http-foundation (v3.1.5)
   
10.     Loading from cache
    
11. 
    
12.   - Installing psr/http-message (1.0.1)
    
13.     Loading from cache
    
14. 
    
15.   - Installing symfony/psr-http-message-bridge (v0.4)
    
16.     Downloading: 100%
    
17. 
    
18.   - Installing guzzlehttp/promises (1.2.0)
    
19.     Loading from cache
    
20. 
    
21.   - Installing guzzlehttp/psr7 (1.3.1)
    
22.     Loading from cache
    
23. 
    
24.   - Installing guzzlehttp/guzzle (6.2.2)
    
25.     Loading from cache
    
26. 
    
27.   - Installing doctrine/cache (v1.6.0)
    
28.     Loading from cache
    
29. 
    
30.   - Installing overtrue/socialite (1.0.18)
    
31.     Downloading: 100%
    
32. 
    
33.   - Installing psr/log (1.0.2)
    
34.     Loading from cache
    
35. 
    
36.   - Installing monolog/monolog (1.21.0)
    
37.     Loading from cache
    
38. 
    
39.   - Installing pimple/pimple (v3.0.2)
    
40.     Loading from cache
    
41. 
    
42.   - Installing overtrue/wechat (3.1.5)
    
43.     Downloading: 100%
    
44. 
    
45. symfony/psr-http-message-bridge suggests installing zendframework/zend-diactoros (To use the Zend Diactoros factory)
    
46. monolog/monolog suggests installing aws/aws-sdk-php (Allow sending log messages to AWS services like DynamoDB)
    
47. monolog/monolog suggests installing doctrine/couchdb (Allow sending log messages to a CouchDB server)
    
48. monolog/monolog suggests installing ext-amqp (Allow sending log messages to an AMQP server (1.0+ required))
    
49. monolog/monolog suggests installing ext-mongo (Allow sending log messages to a MongoDB server)
    
50. monolog/monolog suggests installing graylog2/gelf-php (Allow sending log messages to a GrayLog2 server)
    
51. monolog/monolog suggests installing mongodb/mongodb (Allow sending log messages to a MongoDB server via PHP Driver)
    
52. monolog/monolog suggests installing php-amqplib/php-amqplib (Allow sending log messages to an AMQP server using php-amqplib)
    
53. monolog/monolog suggests installing php-console/php-console (Allow sending log messages to Google Chrome)
    
54. monolog/monolog suggests installing rollbar/rollbar (Allow sending log messages to Rollbar)
    
55. monolog/monolog suggests installing ruflin/elastica (Allow sending log messages to an Elastic Search server)
    
56. monolog/monolog suggests installing sentry/sentry (Allow sending log messages to a Sentry server)
    
57. Writing lock file
    
58. Generating autoload files

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执行完成，composer.json在require中自动添加了包依赖：

1. "overtrue/wechat": "^3.1"

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在vendor目录中，我们发现多了几个目录：

1. doctrine、guzzlehttp、monolog、overtrue、pimple、psr、symfony
   

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以上目录中，除overtrue为我们主动安装的第三方包之外，其它的均是overtrue方依赖的第三方包，Composer是为解决这些依赖而生的，细节相关，请查阅官方文档资料。

配置Easywechat：
在application/config目录中新增 easywechat.php文件，使配置如下：

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<?php$config["wechat"] = [    'debug' => true,        /**     * 账号基本信息，请从微信公众平台/开放平台获取     */    'app_id' => 'app-id',    'secret' => 'app-secret',    'token' => 'token',    'aes_key' => 'EncodingAESKey',         /**     * OAuth 配置     *     * scopes：公众平台（snsapi_userinfo / snsapi_base），开放平台：snsapi_login     * callback：OAuth授权完成后的回调页地址     */    'oauth' => [        'scopes' => [            'snsapi_userinfo'        ],        'callback' => env('WECHAT_OAUTH_CALLBACK','oauth_callback'),    ],    /**     * Guzzle 全局设置     *     * 更多请参考： http://docs.guzzlephp.org/en/l ... .html     */    'guzzle' => [        'timeout' => 3.0// 超时时间（秒）    ]   ];
 

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注：本文只为引入使用基本功能，详细配置请参阅：【官方配置】

创建application/controllers/Weixin.php

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<?php
//引入easywechat包
use EasyWeChat\Foundation\Application;
 
class Weixin extends My_Controller
{
    //声明wechat类资源句柄
    protected $wechat = NULL;
   
    public function __construct()
    {
        parent::__construct();
        //加载easywechat配置文件
        $this->load->config("easywechat");
        //实例化easywechat包
        $this->wechat = new Application(config_item("wechat"));
    }
   
    public function index(){
        echo "发起授权请求：<a href='weixin/oauth'>./weixin/oauth</a><br>";
        echo "获取用户信息：<a href='weixin/user'>./weixin/user</a><br>";
    }
   
    public function user(){
        //获得用户信息
        //1.用户须已经关注此公众号
        //2.通过openid来进行获取
        $user = $this->wechat->user->get("oRGOms1oh2TtkvHK-FoQA4tnWH_U");
        var_dump($user);
    }
   
    //微信用户进行公众号授权
    public function oauth(){
        $response = $this->wechat->oauth->with(['state'=>$backurl])->redirect();
        $response->send();
    }
    //回调地址，在此拿到用户的信息及access_token相关信息
    public function oauth_callback(){
        $response = $this->wechat->oauth->user();
        var_dump($response);
    }
}

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本文只做了简单的示例操作，具体的业务逻辑取决于各种应不同而不同。