php获取微信openid

使用微信接口，无论是自动登录还是微信支付我们首先需要获取的就是openid,获取openid的方式有两种，一种是在关注的时候进行获取，这种订阅号就可以获取的到，第二种是通过网页授权获取，这种获取需要的是认证服务号。

今天我要说的是第二种网页授权获取openid。下面是我写的一个关于获取openid的类

<?php /**  * 微信授权相关接口  *   * @link http://www.phpddt.com  */ class Wchat {       private $app_id = 'wx444444444444';       private $app_secret = '77777777';      private $state='aaaa';    /**      * 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={$state}#wechat_redirect";     }      /**      * 获取微信openid      */     public function getOpenid($turl)     {         if (!isset($_GET['code'])){             //触发微信返回code码                           $url=$this->get_authorize_url($turl, $this->state);                          Header("Location: $url");             exit();         } else {             //获取code码，以获取openid             $code = $_GET['code'];             $access_info = $this->get_access_token($code);             return $access_info;         }              }     /**      * 获取授权token网页授权      *       * @param string $code 通过get_authorize_url获取到的code      */     public function get_access_token($code = '')     {       $appid=$this->app_id;       $appsecret=$this->app_secret;                $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$appsecret."&code=".$code."&grant_type=authorization_code";         //echo $token_url;         $token_data = $this->http($token_url);        // var_dump( $token_data);         if($token_data[0] == 200)         {             $ar=json_decode($token_data[1], TRUE);             return $ar;         }                  return $token_data[1];     }               public function http($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);     }   } ?>

getOpenid($turl)这个方法就是获取openid的方法。前端调用代码如下：

      $openid=isset($_COOKIE['openid'])?$_COOKIE['openid']:'';                      if(empty($openid))             {                 $wchat=new wchat();                 $t_url='http://'.$_SERVER['HTTP_HOST'].'/user.php?act=register';                                  $info=$wchat->getOpenid($t_url);                                  if($info){                      $openid=$info['openid'];                   setcookie('openid',$openid,time()+86400*30);                                          }                              }

以上就是我总结的获取openid的方法啦。

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