Many of today’s activities guide users to follow public accounts in order to participate in activities. How to judge whether users have followed public accounts is actually very simple. Follow this article and you will no longer have to worry. The php code in this article is very simple. Explained in detail.

1. WeChat public platform configuration

1. Obtain appid, appsecret, add whitelist

Log in to WeChat public platform and enter basic configuration. Two parameters need to be used in development, appId and appSecret (appSecret is only displayed once and needs to be saved, otherwise it needs to be reset and obtained).
You need to add an IP whitelist when obtaining access_token.

Click to view

Click to modify

2. Add web page authorization

Enter the official account settings=》Function settings=》Web page authorized domain name
Click settings, enter the domain name of the authorization callback page in the input box, refer to point 1 (only one can be filled in), download the txt in point 3 Documents are uploaded to the root directory of the server.

2. PHP backend implementation

1. Obtain global token

This token is valid for 2 hours and can be temporarily stored. It is required after expiration Reacquire.
PS: The project must use the same interface, otherwise it will easily lead to expiration due to mutual brushing.

public static function getToken($appid, $appsecret){
    $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$appid.'&secret='.$appsecret;
    return Curl::callWebServer($url);
}

正確返回結(jié)果：
    {
        "access_token": "ACCESS_TOKEN",
        "expires_in": 7200
    }
    返回結(jié)果參數(shù)說明：
    參數(shù)              說明
    access_token      獲取到的全局token
    expires_in        憑證有效時(shí)間，單位：秒
    
錯(cuò)誤返回結(jié)果：
    {"errcode": 40013, "errmsg": "invalid appid"}
    返回結(jié)果參數(shù)說明：
    返回碼    說明
    -1       系統(tǒng)繁忙，此時(shí)請開發(fā)者稍候再試
    0        請求成功
    40001    AppSecret錯(cuò)誤或者AppSecret不屬于這個(gè)公眾號，請開發(fā)者確認(rèn)        AppSecret的正確性
    40002    請確保grant_type字段值為client_credential
    40164    調(diào)用接口的IP地址不在白名單中，請?jiān)诮涌贗P白名單中進(jìn)行設(shè)置。（小程序及小游戲調(diào)用不要求IP地址在白名單內(nèi)。）

2. Obtaining the openid of the public account associated with the user

is a two-step process. First, obtain the user's authorization code for the public account, and then use this code to obtain the temporary access_token and openid.

Get user authorization code

public static function getCode($appId, $redirect_uri, $state=1, $scope='snsapi_base', $response_type='code'){
    $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.$appId.'&redirect_uri='.$redirect_uri.'&response_type='.$response_type.'&scope='.$scope.'&state='.$state.'#wechat_redirect';
    header('Location: '.$url, true, 301);
}

正確返回結(jié)果：
    返回code碼，并且跳轉(zhuǎn)回調(diào)頁面$redirect_uri
    
錯(cuò)誤返回結(jié)果：
    {"errcode": 10003, "errmsg": "redirect_uri域名與后臺(tái)配置不一致"}
    返回結(jié)果參數(shù)說明：
    返回碼    說明
    10003    redirect_uri域名與后臺(tái)配置不一致
    10004    此公眾號被封禁
    10005    此公眾號并沒有這些scope的權(quán)限
    10006    必須關(guān)注此測試號
    10009    操作太頻繁了，請稍后重試
    10010    scope不能為空
    10011    redirect_uri不能為空
    10012    appid不能為空
    10013    state不能為空
    10015    公眾號未授權(quán)第三方平臺(tái)，請檢查授權(quán)狀態(tài)
    10016    不支持微信開放平臺(tái)的Appid，請使用公眾號Appid

The code obtained through getCode is exchanged for the access_token and openid authorized by the webpage

public static function getAccessToken($code, $appid, $appsecret, $grant_type='authorization_code'){
    $url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$appsecret.'&code='.$code.'&grant_type='.$grant_type.'';
    return Curl::callWebServer($url);
}
   
正確返回結(jié)果：
    { 
        "access_token": "ACCESS_TOKEN",
        "expires_in": 7200,
        "refresh_token": "REFRESH_TOKEN",
        "openid": "OPENID",
        "scope": "SCOPE"
    }
    返回參數(shù)說明
    參數(shù)            描述
    access_token    網(wǎng)頁授權(quán)接口調(diào)用憑證,注意：此access_token與基礎(chǔ)支持的access_token不同
    expires_in    access_token接口調(diào)用憑證超時(shí)時(shí)間，單位（秒）
    refresh_token    用戶刷新access_token
    openid    用戶唯一標(biāo)識，請注意，在未關(guān)注公眾號時(shí)，用戶訪問公眾號的網(wǎng)頁，也會(huì)產(chǎn)生一個(gè)用戶和公眾號唯一的OpenID
    scope    用戶授權(quán)的作用域，使用逗號（,）分隔
    
錯(cuò)誤返回結(jié)果：
    {"errcode":40029, "errmsg":"invalid code"}

3. Obtain user information

Use the first Use the openId obtained in step 2 and the token obtained in step 1 to obtain user information

public static function getUserInfo($openId, $token){
    $url = 'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$token.'&openid='.$openId.'&lang=zh_CN';
    return Curl::callWebServer($queryUrl, '', 'GET');
}
正確返回結(jié)果：
    {
        "subscribe": 1, 
        "openid": "o6_bmjrPTlm6_2sgVt7hMZOPfL2M", 
        "nickname": "Band", 
        "sex": 1, 
        "language": "zh_CN", 
        "city": "廣州", 
        "province": "廣東", 
        "country": "中國", 
        "headimgurl":"http://thirdwx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/0",
        "subscribe_time": 1382694957,
        "unionid": " o6_bmasdasdsad6_2sgVt7hMZOPfL"
        "remark": "",
        "groupid": 0,
        "tagid_list":[128,2],
        "subscribe_scene": "ADD_SCENE_QR_CODE",
        "qr_scene": 98765,
        "qr_scene_str": ""
    }
    返回參數(shù)說明：
        參數(shù)            說明
        subscribe       用戶是否訂閱該公眾號標(biāo)識，值為0時(shí)，代表此用戶沒有關(guān)注該公眾號，拉取不到其余信息。
        openid          用戶的標(biāo)識，對當(dāng)前公眾號唯一
        nickname        用戶的昵稱
        sex             用戶的性別，值為1時(shí)是男性，值為2時(shí)是女性，值為0時(shí)是未知
        city            用戶所在城市
        country         用戶所在國家
        province        用戶所在省份
        language        用戶的語言，簡體中文為zh_CN
        headimgurl      用戶頭像，最后一個(gè)數(shù)值代表正方形頭像大小（有0、46、64、96、132數(shù)值可選，0代表640*640正方形頭像），用戶沒有頭像時(shí)該項(xiàng)為空。若用戶更換頭像，原有頭像URL將失效。
        subscribe_time  用戶關(guān)注時(shí)間，為時(shí)間戳。如果用戶曾多次關(guān)注，則取最后關(guān)注時(shí)間
        unionid         只有在用戶將公眾號綁定到微信開放平臺(tái)帳號后，才會(huì)出現(xiàn)該字段。
        remark          公眾號運(yùn)營者對粉絲的備注，公眾號運(yùn)營者可在微信公眾平臺(tái)用戶管理界面對粉絲添加備注
        groupid         用戶所在的分組ID（兼容舊的用戶分組接口）
        tagid_list      用戶被打上的標(biāo)簽ID列表
        subscribe_scene 返回用戶關(guān)注的渠道來源，ADD_SCENE_SEARCH 公眾號搜索，ADD_SCENE_ACCOUNT_MIGRATION 公眾號遷移，ADD_SCENE_PROFILE_CARD 名片分享，ADD_SCENE_QR_CODE 掃描二維碼，ADD_SCENEPROFILE LINK 圖文頁內(nèi)名稱點(diǎn)擊，ADD_SCENE_PROFILE_ITEM 圖文頁右上角菜單，ADD_SCENE_PAID 支付后關(guān)注，ADD_SCENE_OTHERS 其他
        qr_scene        二維碼掃碼場景（開發(fā)者自定義）
        qr_scene_str    二維碼掃碼場景描述（開發(fā)者自定義）

錯(cuò)誤結(jié)果：
    {"errcode":40013,"errmsg":"invalid appid"}

3. Use

to determine whether you have followed it. Here is the entrance:

public function isConcern($appId, $appSecret) {
    $param = ''; // 如果有參數(shù)
    $this->getCode($appId, U('callback', 'param='.$param), 1 ,'snsapi_base');
}

Callback after authorization

public function callback(){
    $isconcern = 0;
    $code = $this->_get('code');
    $param = $this->_get('param');
    $appId = C('appId'); // config中配置
    $appSecret = C('appSecret');
    $accessTokenInfo = $this->getAccessToken($code, $appId, $appSecret);
    $openId = $accessTokenInfo['openid'];
    $accessToken = $accessTokenInfo['access_token'];
    $token = $this->getToken($appId, $appSecret);
    $userInfo = $this->getUserInfo($openId, $token['access_token']);
    if($userInfo['subscribe'] == 1){
        $this->assign('userInfo', $userInfo);
        $isconcern = 1; // 已關(guān)注
    } else {
        $isconcern = 0; // 未關(guān)注
    }
    $this->assign('openid', $openId);
    $this->display('page');
}

At this time, userInfo and isconcern can be obtained on the page. When isconcern is 1, it means that the official account has been followed, otherwise it has not been followed.

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