微信开放平台网站应用扫码登录

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<?php
namespace app\common\wechat;
/**
 * 微信开放平台
 * Date: 2020/9/08 0015
 * Time: 上午 10:03
 */
class WXOpenPlatform{
    private static $appId = 'xxxxxxxxxxxxxxxxxxxxxxxxx';
    private static $appSecret = 'xxxxxxxxxxxxxxxxxxxxxxxxx';
    private static $scope = 'snsapi_login';

    /**
     * curl请求
     * @param $url
     * @return mixed
     */
    public static function https_request($url, $data = null) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)) {
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }

    /**
     * 第一步：用户同意授权，获取code
     * @param $redirect_uri
     * @param int $state
     * @return string
     */
    public static function getCode($redirect_uri, $state = 1){
        $redirect_uri = urlencode($redirect_uri);     //用urlEncode对链接进行处理
        $code_url = 'https://open.weixin.qq.com/connect/qrconnect?appid='.self::$appId.'&redirect_uri='.$redirect_uri.'&response_type=code&scope='.self::$scope.'&state='.$state.'#wechat_redirect';
        return $code_url;
    }

    /**
     * 第二步：通过code换取网页授权access_token
     * 正常结果：return { "access_token":"ACCESS_TOKEN",
     *          "expires_in":7200,
     *          "refresh_token":"REFRESH_TOKEN",
     *          "openid":"OPENID",
     *          "scope":"SCOPE" }
     * 错误是的结构：{"errcode":40029,"errmsg":"invalid code"}
     */
    public static function getAccessToken($code){
        //从微信接口获取
        $accessTokenApi = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.self::$appId.'&secret='.self::$appSecret.'&code='.$code.'&grant_type=authorization_code';
        $res = self::https_request($accessTokenApi);
        $result = json_decode($res, true);
        return $result;
    }


    /**
     * 第三步：刷新access_token（如果需要）
     * 正常结果：return { "access_token":"ACCESS_TOKEN",
     *          "expires_in":7200,
     *          "refresh_token":"REFRESH_TOKEN",
     *          "openid":"OPENID",
     *          "scope":"SCOPE" }
     * 错误是返回结果：{"errcode":40029,"errmsg":"invalid code"}
     */
    public static function refreshAccessToken($refreshToken){
        $refreshAccessTokenApi = 'https://api.weixin.qq.com/sns/oauth2/refresh_token?appid='.self::$appId.'&grant_type=refresh_token&refresh_token='.$refreshToken;
        $res = self::https_request($refreshAccessTokenApi);
        $result = json_decode($res, true);
        return $result;
    }
    /**
     * 第四步：拉取用户信息
     * 正常返回结果：{"openid":" OPENID",
     *               "nickname": NICKNAME,
     *               "sex":"1",
     *               "province":"PROVINCE"
 *                   "city":"CITY",
     *               "country":"COUNTRY",
     *               "headimgurl":"http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ
     *                              4eMsv84eavHiaiceqxibJxCfHe/46",
     *               "privilege":[ "PRIVILEGE1" "PRIVILEGE2"     ],
     *               "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
     *              }
     * 错误时返回结果：{"errcode":40003,"errmsg":" invalid openid "}
     */
    public static function getUserInfo($openId,$accessToken){
        $userInfoApi = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$accessToken.'&openid='.$openId.'&lang=zh_CN';
        $res = self::https_request($userInfoApi);
        $result = json_decode($res, true);
        return $result;
    }
    /**
     * 附：检验授权凭证（access_token）是否有效
     * 正确的JSON返回结果：
     * { "errcode":0,"errmsg":"ok"}
     * 错误时的JSON返回示例：
     * { "errcode":40003,"errmsg":"invalid openid"}
     */
    public static function checkAccessToken($openId,$accessToken){
        $checkAccessTokenUrl = 'https://api.weixin.qq.com/sns/auth?access_token='.$accessToken.'&openid='.$openId;
        $res = self::https_request($checkAccessTokenUrl);
        $result = json_decode($res, true);
        return $result;
    }
}