在CodeIgniter中使用微信开发类库

在CI中国论坛里，Hex老大很早就写了一个微信开发的类库，原文地址： http://codeigniter.org.cn/forums/forum.php?mod=viewthread&tid=16665

这个类库很简洁，符合CI开发模式，不过功能过于简单，所以要使用一些高级的微信开发接口，推荐使用这个比较收欢迎的微信开发类库： https://github.com/dodgepudding/wechat-php-sdk

不过这个类库不是CI的，需要封装一下，下面讲讲我的封装，封装的有点过度，你可以按照自己的意愿稍加改造。

1.首先git clone https://github.com/dodgepudding/wechat-php-sdk.git 源代码wechat.php，放到CI的library文件夹下；

2.然后我们扩展一下wechat.php，为它加入一些事件委托，防止你每次写具体逻辑时要写一堆的switch或者if/else语句，这里就看你是否习惯我这种写法了。新建类库wechatex.php放到library下，源代码如下：

<?phpinclude APPPATH.'libraries/wechat.php';class WechatEx extends Wechat { const EVENT_SUBSCRIBE  = 'SUBSCRIBE'; // 没关注时扫描：订阅公共号 const EVENT_UNSUBSCRIBE = 'UNSUBSCRIBE';// 已关注后，手动取消订阅号时触发 const EVENT_SCAN = 'SCAN'; //关注后再次扫描 const EVENT_CLICK = 'CLICK'; //点击推事件 const EVENT_VIEW = 'VIEW'; //跳转URL  const EVENT_LOCATION = 'LOCATION'; //用户同意上传位置信息后，服务器每5秒钟推送触发  const EVENT_SCANCODE_PUSH = 'SCANCODE_PUSH';//用户点击自定义扫描按钮，扫码推事件 const EVENT_SCANCODE_WAITMSG = 'SCANCODE_WAITMSG';//扫码推事件且弹出消息接收中提示框  const EVENT_PIC_SYSPHOTO = 'PIC_SYSPHOTO';//弹出系统拍照发图 const EVENT_PIC_PHOTO_OR_ALBUM = 'PIC_PHOTO_OR_ALBUM'; //弹出拍照或者相册发图 const EVENT_PIC_WEIXIN = 'PIC_WEIXIN'; //弹出微信相册发图器  const EVENT_LOCATION_SELECT = 'LOCATION_SELECT';//弹出地理位置选择器  function __construct($options) {  parent::__construct($options); }   public function run() {  $this->valid();  $type = $this->getRev()->getRevType();  switch($type) {      case Wechat::MSGTYPE_TEXT:    $this->onText();    break;   case Wechat::MSGTYPE_EVENT:    $info = $this->getRevEvent(); //event, key    if (isset($info['event'])){     switch(strtoupper($info['event'])){      case self::EVENT_SUBSCRIBE:       $this->onSubscribe();       break;      case self::EVENT_UNSUBSCRIBE:       $this->onUnsubscribe();       break;       //关注后再次扫描      case self::EVENT_SCAN:       $this->onScan();       break;            case self::EVENT_LOCATION:       $this->onLocation();       break;      //点击菜单时：CLICK      case self::EVENT_CLICK:          //EventKey：与自定义菜单接口中KEY值对应        $this->onClick();       break;             //点击菜单跳转链接时的事件推送       case self::EVENT_VIEW:         //EventKey：设置的跳转URL       $this->onView();       break;      case self::EVENT_SCANCODE_PUSH:       $this->onScanCodePush();       break;      case self::EVENT_SCANCODE_WAITMSG:       $this->onScanCodeWaitMsg();       break;            case self::EVENT_PIC_SYSPHOTO:       $this->onPicSysPhoto();       break;             case self::EVENT_PIC_PHOTO_OR_ALBUM:       $this->onPicPhotoOrAlbum();       break;             case self::EVENT_PIC_WEIXIN:       $this->onPicWeixin();       break;      case self::EVENT_LOCATION_SELECT:       $this->onLocationSelect();       break;      default:       $this->onUnknown();     }    }    break;   case Wechat::MSGTYPE_IMAGE:    $this->onImage();    break;   case Wechat::MSGTYPE_LOCATION:    $this->onLocation();    break;   case Wechat::MSGTYPE_LINK:    $this->onLink();    break;   case Wechat::MSGTYPE_VOICE:    $this->onVoice();    break;   case Wechat::MSGTYPE_VIDEO:    $this->onVideo();    break;   default:    $this->onUnknown();  } }  protected function onScanCodePush(){$this->defaultReply();} protected function onScanCodeWaitMsg(){$this->defaultReply();}  protected function onPicWeixin(){$this->defaultReply();} protected function onPicSysPhoto(){$this->defaultReply();} protected function onPicPhotoOrAlbum(){$this->defaultReply();}  protected function onLocationSelect(){$this->defaultReply();}   /**     * 用户关注时触发，用于子类重写     *     * @return void     */    protected function onSubscribe() {  $this->defaultReply(); }       protected function onUnsubscribe() {   $this->defaultReply(); }  protected function onClick(){  $this->defaultReply(); }   protected function onView() {  $this->defaultReply(); }   protected function onScan(){  $this->defaultReply(); }  /*    1 文本消息    2 图片消息    3 语音消息    4 视频消息    5 地理位置消息    6 链接消息 */    protected function onText() {  $this->defaultReply(); }  protected function onImage() {  $this->defaultReply(); } protected function onVoice(){  $this->defaultReply(); } protected function onVideo(){  $this->defaultReply(); } protected function onLocation(){  $this->defaultReply(); } protected function onLink() {  $this->defaultReply(); }    protected function onUnknown() {  $this->defaultReply(); }  protected function defaultReply(){  $this->text('')->reply(); }  }

3.再次扩展wechatex.php，新建mywechat.php放到library下，这里就要写具体的实现逻辑了：

<?phpinclude APPPATH.'libraries/wechatex.php';class MyWechat extends WechatEx { private $_ci; function __construct($options){  parent::__construct($options);  if (function_exists("get_instance") && defined("APPPATH")){    $this->_ci =& get_instance();   $this->_ci->load->model('product_model', 'product');   //$this->_ci->load->model('post_model', 'post');  } } protected function onSubscribe() {     $this->text('终于等到你。感谢你关注……')->reply();    }        protected function onUnsubscribe() {    $this->text('悄悄地我走了，正如我悄悄地来。')->reply();    } protected function onText(){} protected function onLocation() {  $info = $this->getRevGeo();  $this->text("收到了位置消息：({$info['x']},{$info['y']})")->reply();    }protected function onLink() {      $info = $this->getRevLink();      $url = $info['url'];   $this->text("收到链接消息：({$info['url']},{$info['title']},{$info['description']})")->reply();    } protected function onVoice() {      $info = $this->getRevVoice();   $this->text("收到链接消息：({$info['mediaid']},{$info['format']})")->reply();     }protected function onUnknown() {      $this->text('收到未知消息')->reply();    }//以下是cache的保存，按照具体情形保存你的token，因为微信服务器规定token的获取次数是有限制的，不要请求太多次数。 protected function setCache($cachename, $value, $expired){  $this->_ci->load->model('setting_model', 'setting');  $this->_ci->setting->set($cachename, array(   'value' => $value,   'expire_time'=> time() + $expired)  ); }  protected function getCache($cachename){  $this->_ci->load->model('setting_model', 'setting');  $data = $this->_ci->setting->get($cachename);  if(empty($data) || time() > $data['expire_time'])   return false;  return $data['value']; }  protected function removeCache($cachename){  $this->_ci->load->model('setting_model', 'setting');  $this->_ci->setting->remove($cachename); }//真实微信号里只要有的事件，具体逻辑就可以写到这里。}

4.最后，你需要一个控制器，在控制器之前，我们来一个配置文件，wechat.php放到config下：

<?php$config['wechat'] = array( 'token'=>'CodeIgniter', //填写你设定的key 'appid'=>'wx1357312bf6f6f5df', //填写高级调用功能的app id 'appsecret'=>'0bf5ef023cd0318808b52232e3fc2315', //  'partnerid'=>'88888888', //财付通商户身份标识 'partnerkey'=>'', //财付通商户权限密钥Key 'paysignkey'=>'', //商户签名密钥Key 'debug'=>true);$config['wechat_menu'] = array( "button"=>array(   array(    "type"=>"pic_photo_or_album",    "name"=>"我卖",    "key"=>"upload_pics"     ),     array(    "type"=>"view",    "name"=>"逛逛",    "url"=> site_url('product/discovery')     ),     array(      "name"=>"我的",      "sub_button"=>array(     array(        "type"=>"view",        "name"=>"正在出售",        "url"=>site_url('user/product/index')     ),     array(        "type"=>"view",        "name"=>"个人中心",        "url"=>site_url('user/home/index')     ),     array(        "type"=>"view",        "name"=>"帮助",        "url"=>site_url('home/weixin_help')     )    )      )  ));

最后的最后，实现一个简单的微信控制器， weixin.php。这里不要命名成wechat.php，因为CI中已经含有wechat对象了，那就是那个类库，如果再把控制器也命名为wechat.php就会出错，简单地说，CI中类库的名字和控制器的名字不能重复，否则出错。不要跳坑。代码如下：

class Weixin extends MY_Controller{ function __construct(){        parent::__construct();  $this->config->load('wechat');  $options = $this->config->item('wechat');  $options['logcallback'] = 'logdebug';  $this->load->library('mywechat', $options);    }  public function api(){  $this->mywechat->run(); }  public function menu(){  $menus = $this->config->item('wechat_menu');  $flag = $this->mywechat->createMenu($menus);  echo !$flag ? 'FALSE' : json_encode($menus); }//其他的一些逻辑……}function logdebug($text){   file_put_contents('./upload/log.txt',$text."\n",FILE_APPEND);}

在微信开发者模式下，填入以下API： http://www.abc.com/weixin/api即可。如果需要更改菜单，可以使用： http://www.abc.com/weixin/menu 刷新，当然你可以自己做个菜单系统，不像我这样把菜单写死。欢迎大家批评指正。

文章来源：http://www.tuicool.com/articles/eIvYna