微信网页授权

微信网页授权一共分为以下几步：

(我用的微信测试号，授权之前要配置好授权回调域名，如为百度：www.baidu.com，只此格式，不要加http以及后面不要加任何路径和/等其他字符)

不了解的可以先看看微信官方文档：点击打开链接

整体代码流程：

1.wechat.php页面方法中调用webAuthorize()授权方法

2.授权方法中又包括webCode()获取code方法

3.授权完成，根据授权方法中回调地址访问其路径，即wechatUser.php

4.wechetUser.php页面方法调用webUser()方法来拉取微信用户信息

5.webUser()方法又包含webAccessToken()方法，获取到token后拉取用户信息并返回

以下是我写的授权流程代码：

1.访问调取网页授权方法：wechat.php

    /**
     * 调用网页授权
     */
    public function actionWebAuthorize()
    {
        $return_url = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
        $wechat = new LibWechat();     //微信相关所有方法封装的一个类库
        if (empty($_SESSION['user_openid'])) {
            $wechat->webAuthorize($return_url); //调用网页授权方法
        }
    }

2.调取网页授权所有类方法，libWecaht.php类文件

class LibWechat extends Base
{
    private $appid = '';    //自己appid
    private $appsecret = ''; //自己appsecret
    private $_access_token; //微信网页授权
    public $error;
    public $return_url; //用户同意授权跳转页面
    public $path;  //用户授权前所在页面（用于授权后回调）
    public $code;  //授权code
    public $open_id; //openid,用户唯一凭证

   /**
     * 调取网页授权信息
     */
    public function webAuthorize($return_url)
    {
        $this->path = 'http://www.aa.com/wechatuser/user'; //授权后回调地址
        $this->return_url = $return_url;
        $this->webCode();
    }

    /**
     * 获取微信网页授权code
     */
    public function webCode($user_info = true)
    {
        if (empty($this->path)) {
            $this->error = "跳转地址不能为空";
            return false;
        }
        $scope = $user_info ? 'snsapi_userinfo' : 'snsapi_base';

        $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=' . $this->appid . '&redirect_uri=' . urlencode($this->path) . '&response_type=code&scope=' . $scope . '&state=' . urlencode($this->return_url) . '#wechat_redirect';
        header('location:' . $url);
    }

    /**
     * 获取网页授权 _access_token
     */
    public function webAccessToken()
    {
        $this->code = $_GET['code'];
        if (empty($this->code)) {
            $this->error = "code不能为空";
            return false;
        }
        if (empty($_SESSION['access_token'])) {
            $url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $this->appid . '&secret=' . $this->appsecret . '&code=' . $this->code . '&grant_type=authorization_code';
            $result = json_decode($this->requestUrl($url), true);

            if (empty($result['access_token'])) {
                $this->error = $result['errorMsg'];
                return false;
            }
            $_SESSION['access_token'] = $result['access_token'];
            $_SESSION['user_openid'] = $result['openid'];
            $_SESSION['user_unionid'] = $result['unionid'];

            $this->open_id = $result['openid'];
            $this->_access_token = $result['access_token'];
        }
        $this->_access_token = $_SESSION['access_token'];
    }

    /**
     * 获取用户基本信息
     */
    public function webUser()
    {
        if (empty($this->_access_token) || empty($this->open_id)) {
            $this->webAccessToken();
        }
        $url = 'https://api.weixin.qq.com/sns/userinfo?access_token=' . $this->_access_token . '&openid=' . $this->open_id . '&lang=zh_CN';
        return json_decode($this->requestUrl($url), true);
    }


    /**
     * curl 请求
     */
    public function requestUrl($url, $data = '')
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); //禁止 cURL 验证对等证书
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); // 为SSL不检查名称
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        // curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);

        if (!empty($data)) {

            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        }
        $result = curl_exec($ch);

        curl_close($ch);
        return $result;
    }

3.授权后回调到另一个页面，处理业务逻辑，wecahtUser.php

    /**
     * 网页授权后业务处理
     */
    public function actionUser()
    {
        $wechat = new LibWechat();
        $web_users = $wechat->webUser();
        print_r($web_users);
    }