PHP+Facebook

1、创建应用 https://developers.facebook.com/

image.png
image.png
2、进入应用，添加产品：Facebook登录
点击设置-》基本 获取编号秘钥
进入Facebook登录-》设置 来设置允许的回调地址
3、下载SDK：https://github.com/facebookarchive/php-graph-sdk
4、获取登录链接并跳转

        require APP_ROOT_PATH."system/Facebook/autoload.php";
        //创建实例
        $fb = new \Facebook\Facebook([
            'app_id' => '你的应用编号', // 这里就是应用的APPID
            'app_secret' => '你的秘钥', //这里填写应用的密钥
            'default_graph_version' => 'v2.10',//这里sdk的版本号
        ]);
        $helper = $fb->getRedirectLoginHelper();
        //需要获取的登录用户参数，有的参数需要权限
        $permissions = ['email']; // Optional permissions\
        $aUrl = 你的回调地址;
        //获取到的登录连接
        $loginUrl = $helper->getLoginUrl($aUrl, $permissions);
//        $loginUrl = htmlspecialchars($loginUrl);
        return redirect($loginUrl);

5、回调

          session_start();
            require APP_ROOT_PATH."system/Facebook/autoload.php";
            $fb = new \Facebook\Facebook([
                'app_id' => '你的编号', // 这里就是应用的APPID
                'app_secret' => '你的秘钥', //这里填写应用的密钥
                'default_graph_version' => 'v2.10',//这里sdk的版本号
            ]);
            //var_dump($_GET['state']);
            $helper = $fb->getRedirectLoginHelper();
            if(isset($_GET['state'])){
                $_SESSION['FBRLH_state']=$_GET['state'];
            }
            try {
                $accessToken = $helper->getAccessToken();
            } catch(Facebook\Exceptions\FacebookResponseException $e) {
                // When Graph returns an error
                echo 'Graph returned an error: ' . $e->getMessage();
                exit;
            } catch(Facebook\Exceptions\FacebookSDKException $e) {
                // When validation fails or other local issues
                echo 'Facebook SDK returned an error: ' . $e->getMessage();
                exit;
            }

            if (! isset($accessToken)) {
                if ($helper->getError()) {

                    header('HTTP/1.0 401 Unauthorized');
                    echo "Error: " . $helper->getError() . "\n";
                    echo "Error Code: " . $helper->getErrorCode() . "\n";
                    echo "Error Reason: " . $helper->getErrorReason() . "\n";
                    echo "Error Description: " . $helper->getErrorDescription() . "\n";
                    $lUrl = get_domain().url("index","user#login");
                    app_redirect($lUrl);
                } else {
                    header('HTTP/1.0 400 Bad Request');
                    echo 'Bad request';
                }
                exit;
            }

            // The OAuth 2.0 client handler helps us manage access tokens
            $oAuth2Client = $fb->getOAuth2Client();

            // Get the access token metadata from /debug_token
            $tokenMetadata = $oAuth2Client->debugToken($accessToken);
//        echo '<h3>Metadata</h3>';
//        var_dump($tokenMetadata);

            // Validation (these will throw FacebookSDKException's when they fail)
            $tokenMetadata->validateAppId('你的编号');
            // If you know the user ID this access token belongs to, you can validate it here
            //$tokenMetadata->validateUserId('123');
            $tokenMetadata->validateExpiration();

            if (! $accessToken->isLongLived()) {
                try {
                    $accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);
                } catch (Facebook\Exceptions\FacebookSDKException $e) {
                    echo "<p>Error getting long-lived access token: " . $helper->getMessage() . "</p>\n\n";
                    exit;
                }
            }
            $_SESSION['fb_access_token'] = (string) $accessToken;
            try {
            // Returns a `Facebook\FacebookResponse` object
            //fields后面的参数是要获取的用户信息

                $response = $fb->get('/me?fields=id,name', $_SESSION['fb_access_token']);//<strong>$_SESSION['fb_access_token']</strong>
            } catch(\Facebook\Exceptions\FacebookResponseException $e) {
                echo 'Graph returned an error: ' . $e->getMessage();
                exit;
            } catch(\Facebook\Exceptions\FacebookSDKException $e) {
                echo 'Facebook SDK returned an error: ' . $e->getMessage();
                exit;
            }
            //获取用户Facebook信息 id：关联Facebookid;name：姓名
            $user = $response->getGraphUser();
            //echo 'Name: ' . $user['id'];
            //拿到这些内容之后,再根据自己的逻辑进行处理