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6195062
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2011-06-01T00:37:53.983
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2011-06-01T00:37:53.983
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A good and easy way to deal with Facebook authentication is to implement the server side flow with the Facebook PHP SDK (<a href="https://github.com/facebook/php-sdk" rel="nofollow">see on github</a>). So you will have something like : <pre><code>require "facebook.php"; $facebook = new Facebook(array( 'appId' => YOUR_APP_ID, 'secret' => YOUR_APP_SECRET, )); $user = $facebook->getUser(); </code></pre> If the user is logged in, then <code>$user</code> is his Facebook ID. You then have to check if you have a valid access token by making an API call : <ul> <li>If it does not raise any exception, then you have a valid access token</li> <li>If it does, then you have to re-authenticate the user.</li> </ul> Here : <pre><code>if ($user) { try { $facebook->api('/me'); } catch (FacebookApiException $e) { $user = null; } } </code></pre> You need then to display the login or logout link : <pre><code><?php if ($user): ?> <a href="<?php echo $facebook->getLogoutUrl() ?>">Logout of Facebook</a> <?php else: ?> <a href="<?php echo $facebook->getLoginUrl() ?>">Login with Facebook</a> <?php endif ?> </code></pre> When the user is logged in and you have a valid access token, you can make API calls to get data from Facebook : <pre><code>$user_profile = $facebook->api('/me'); </code></pre> You may want to check the <a href="https://github.com/facebook/php-sdk/blob/master/examples/example.php" rel="nofollow">example page of the Facebook PHP SDK</a> which is well documented. Hope that helps.
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1. POone time authentication for weblink with facebook app
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1. USQuentin
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