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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