PHP实现微信网页授权开发的步骤

微信网页授权是服务号才有的高级功能，开发者可以通过授权后获取用户的基本信息；在此之前，想要获取消息信息只能在用户和公众号交互时根据openid获取用户信息；而微信网页授权可在不需要消息交互，也不需要关注的情况下获取用户的基本信息。

• 用户授权，获取code；

• 根据code获取access_token【可通过refresh_token刷新获取较长有效期】

 <?php     /**   * 微信授权相关接口   */     class Wechat {        //高级功能-》开发者模式-》获取    private $app_id = 'xxx';    private $app_secret = 'xxxxxxx';          /**     * 获取微信授权链接     *      * @param string $redirect_uri 跳转地址     * @param mixed $state 参数     */    public function get_authorize_url($redirect_uri = '', $state = '')    {      $redirect_uri = urlencode($redirect_uri);      return "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$this->app_id}&redirect_uri={$redirect_uri}&response_type=code&scope=snsapi_userinfo&state={$state}#wechat_redirect";    }        /**     * 获取授权token     *      * @param string $code 通过get_authorize_url获取到的code     */    public function get_access_token($app_id = '', $app_secret = '', $code = '')    {      $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->app_id}&secret={$this->app_secret}&code={$code}&grant_type=authorization_code";      $token_data = $this->http($token_url);            if($token_data[0] == 200)      {        return json_decode($token_data[1], TRUE);      }            return FALSE;    }        /**     * 获取授权后的微信用户信息     *      * @param string $access_token     * @param string $open_id     */    public function get_user_info($access_token = '', $open_id = '')    {      if($access_token && $open_id)      {        $info_url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$open_id}&lang=zh_CN";        $info_data = $this->http($info_url);                if($info_data[0] == 200)        {          return json_decode($info_data[1], TRUE);        }      }            return FALSE;    }        public function http($url, $method, $postfields = null, $headers = array(), $debug = false)    {      $ci = curl_init();      /* Curl settings */      curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);      curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 30);      curl_setopt($ci, CURLOPT_TIMEOUT, 30);      curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);         switch ($method) {        case 'POST':          curl_setopt($ci, CURLOPT_POST, true);          if (!empty($postfields)) {            curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);            $this->postdata = $postfields;          }          break;      }      curl_setopt($ci, CURLOPT_URL, $url);      curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);      curl_setopt($ci, CURLINFO_HEADER_OUT, true);         $response = curl_exec($ci);      $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);         if ($debug) {        echo "=====post data======\r\n";        var_dump($postfields);           echo '=====info=====' . "\r\n";        print_r(curl_getinfo($ci));           echo '=====$response=====' . "\r\n";        print_r($response);      }      curl_close($ci);      return array($http_code, $response);    }     }

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