如何在我的项目中集成登录和facebook按钮

Question

我正在进行一个项目，其中我需要集成facebook。我已经尝试在脸书上创建应用程序id和密钥。但它还没有完成如何做到这一点以及我将如何融入我的项目。

Answer 1

您需要下载Facebook PHP SDK并构建脚本。以下是重定向到登录的脚本：

<?php
session_start();
require_once("lib/src/Facebook/autoload.php");
// 1. init facebook
$fb = new FacebookFacebook([
  'app_id'     => FACEBOOK_APP_ID,
  'app_secret' => FACEBOOK_APP_SECRET
]);
// 2. Login (session_start must be called before)
$helper      = $fb->getRedirectLoginHelper();
if ($_GET['code']){ // 4. IF code existing in the url, it is a redirect (after facebook login)
    try {
      // 5. Get Access Token
      $accessToken = $helper->getAccessToken();
    } catch(FacebookExceptionsFacebookResponseException $e) {
      // When Graph returns an error
      echo 'Graph returned an error: ' . $e->getMessage();
      exit;
    } catch(FacebookExceptionsFacebookSDKException $e) {
      // When validation fails or other local issues
      echo 'Facebook SDK returned an error: ' . $e->getMessage();
      exit;
    }
    if (isset($accessToken)) {
        // 6. Logged in!
        $_SESSION['facebook_access_token'] = (string) $accessToken;
        // 7. Now you can redirect to another page and use the
        //    access token from $_SESSION['facebook_access_token']
        $fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
        try{
            // YOU CAN DO SOMETHING WITH FACEBOOK API HERE
            $response = $fb->get('{DO_SOMETHING_HERE}', $accessToken);
            $result = $response->getDecodedBody();
        } catch(FacebookExceptionsFacebookResponseException $e) {
        } catch(FacebookExceptionsFacebookSDKException $e) {
        }
    }
} else {
    // 3. redirect to facebook link with permission and callback url    
    $redirect_url = {URL_OF_THIS_PAGE};
    $permissions = ['email','publish_actions','public_profile']; // optional
    $loginUrl    = $helper->getLoginUrl($redirect_url, $permissions);
    header ("Location: ".$loginUrl);
    exit;
}
?>