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    <p>Couldn't get you code to work either, it just reloaded. Seems $_REQUEST["signed_request"] was never set.</p> <p>But I got it to work with the code from <a href="http://developers.facebook.com/docs/authentication/" rel="nofollow noreferrer">http://developers.facebook.com/docs/authentication/</a></p> <pre><code> &lt;?php $app_id = "your app id"; $app_secret = "your app secret"; $my_url = "your app url"; session_start(); $code = $_REQUEST["code"]; if(empty($code)) { $_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection $dialog_url = "http://www.facebook.com/dialog/oauth?client_id=" . $app_id . "&amp;redirect_uri=" . urlencode($my_url) . "&amp;state=" . $_SESSION['state']; echo("&lt;script&gt; top.location.href='" . $dialog_url . "'&lt;/script&gt;"); } if($_REQUEST['state'] == $_SESSION['state']) { $token_url = "https://graph.facebook.com/oauth/access_token?" . "client_id=" . $app_id . "&amp;redirect_uri=" . urlencode($my_url) . "&amp;client_secret=" . $app_secret . "&amp;code=" . $code; $response = file_get_contents($token_url); $params = null; parse_str($response, $params); $graph_url = "https://graph.facebook.com/me?access_token=" . $params['access_token']; $user = json_decode(file_get_contents($graph_url)); echo("Hello " . $user-&gt;name); } else { echo("The state does not match. You may be a victim of CSRF."); } </code></pre> <p>That said, I would recommend you to use the Facebook PHP SDK, <a href="http://developers.facebook.com/docs/reference/php/" rel="nofollow noreferrer">http://developers.facebook.com/docs/reference/php/</a> that makes programming facebook apps easier.</p> <h1>EDIT: using the PHP SDK</h1> <p>To authenticate with the PHP SDK, you would do something like the following:</p> <pre><code>// update this to where you've stored the facebook PHP SDK require '../src/facebook.php'; $facebook = new Facebook(array( 'appId' =&gt; 'your app id', 'secret' =&gt; 'your app secret', )); $user = $facebook-&gt;getUser(); if ($user) { print "You've logged in!"; } else { echo("&lt;script&gt; top.location.href='" . $facebook-&gt;getLoginUrl() . "'&lt;/script&gt;"); } </code></pre> <h1>EDIT: headers</h1> <p>Also, try setting this in the first lines of you code:</p> <pre><code>ini_set('session.use_trans_sid', 1); header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"'); </code></pre> <p>This helped me when the fb session was lost sometimes in an app. Found that in this post: <a href="https://stackoverflow.com/questions/6468103/how-to-properly-handle-session-and-access-token-with-facebook-php-sdk-3-0">How to properly handle session and access token with Facebook PHP SDK 3.0?</a></p>
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    1. COHi, thank you **SO MUCH**. 2 last thing : 1) Using this solution, I always get the "The state does not match. You may be a victim of CSRF." message. It seems that $_SESSION is always empty. this said, it works anyway. 2) Could you please provide me a piece of code to do display the permissions dialog using the PHP SDK?
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    2. COglad I could help, I've added how to authenticate using the PHP SDK as well. Don't know why the $_SESSION doesn't work for you. Are you able to set anything in the session?
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    3. COadded some code that might help you with the sessions
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