Using PHP to invoke Facebook api
真心覺得 Facebook api 的官方文件網站很爛,然後 PHP 的 api 用法囉哩八唆的,還不如直接在 php 裡面用 curl 來得方便。
Facebook api 透過 php 的用法,理想上的流程大致是這樣
- 先透過登入頁面(e.g. login.php),取得一個 token 之後,供 call back page (e.g. fb-callback.php)用
- 當每次 token 被使用後,回傳的資料內會有下次該使用的 token,並將原 token expire
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<?php session_start(); require_once('PATH_TO_AUTOLOAD.PHP'); $fb = new Facebook\Facebook([ 'app_id' => 'APP_ID', 'app_secret' => 'APP_SECRET', 'default_graph_version' => 'v2.8' ]); $helper = $fb->getRedirectLoginHelper(); $permissions = ['email', 'publish_actions', 'user_friends']; //permissions want to use $loginUrl = $helper->getLoginUrl('http://www.example.com/fb-callback.php', $permissions); //call back url echo '<a href="' . htmlspecialchars($loginUrl) . '">Log in with Facebook!</a>'; ?>
Call back 處理,拿到 token 做事情,下面例子是用 curl 取得朋友清單(taggable friends)
<?php session_start(); require_once('PATH_TO_AUTOLOAD.PHP'); $fb = new Facebook\Facebook([ 'app_id' => 'APP_ID', 'app_secret' => 'APP_SECRET', 'default_graph_version' => 'v2.8' ]); $helper = $fb->getRedirectLoginHelper(); 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"; } 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(); $url = "https://graph.facebook.com/v2.8/me/taggable_friends?fields=name,picture&limit=5&access_token=" . (string)$accessToken; $headers = array("Content-type: application/json"); $ch = curl_init(); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko"); $st = curl_exec($ch); $result = json_decode($st, TRUE); foreach ($result['data'] as $friend) { echo '<center><img src="' . $friend['picture']['data']['url'] . '"><br>' . $friend['name'] . '</center><br>'; } ?>
p.s. Facebook 的 php api 在這邊,或直接上 github。
Original link: Phanix's Blog