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<!-- App needs to be set as FBML in application settings for this to work --> <!-- For simplicity, this requires the user to add the application before continuing --> <!-- See: http://wiki.developers.facebook.com/index.php/Fb:if-is-app-user --> <!-- If the user is an app user, then do everything --> <!-- Otherwise, skip to the end for similar FBML redirecting to add application page --> <fb:if-is-app-user> <?php // One of the main usages of PEAR is so the include following this note will work unaltered // If it doesn't, then you either have a problem with your PEAR installation, or // your PEAR directory is not in your server's path, or you have not installed the // Services_Facebook PEAR module into your server. // NOTE: as of this writing Validate is required for Services_Facebook yet this package // is not listed as a dependency for Services_Facebook; this is a known error. // This is a listing of my PEAR packages after installing this and other basic packages: /* C:\Users\Owner>pear list INSTALLED PACKAGES, CHANNEL PEAR.PHP.NET: ========================================= PACKAGE VERSION STATE Archive_Tar 1.3.3 stable Auth_SASL 1.0.3 stable Console_Getopt 1.2.3 stable DB 1.7.13 stable HTML_Template_IT 1.2.1 stable Image_GraphViz 1.2.1 stable Log 1.11.5 stable MDB2 2.4.1 stable MDB2_Driver_mysql 1.4.1 stable Mail 1.1.14 stable Net_SMTP 1.3.3 stable Net_Socket 1.0.9 stable PEAR 1.9.0 stable PEAR_Frontend_Web 0.7.4 beta Services_Facebook 0.2.8 alpha Structures_Graph 1.0.3 stable Validate 0.8.2 beta XML_Util 1.2.1 stable */ // Your exact packages may vary, especially since my test installation is a WAMP one... // Of particular note is that PEAR itself may need to be updated; use the following command to do so: // pear install --alldeps PEAR // Also note that some packages (including Services_Facebook and Validate) are either alpha or beta // These packages need to be installed while the system is in the corresponding state like: // pear config-set preferred_state beta // pear install --alldeps Validate // pear config-set preferred_state alpha // pear install --alldeps Services_Facebook // pear config-set preferred_state stable // The previous comments should serve to underscore that there are potentially a lot of things // that can go wrong with getting to the point where you can use this test code. require_once 'Services/Facebook.php'; // Set globals Services_Facebook::$apiKey = 'xxx'; Services_Facebook::$secret = 'xxx'; try { $api = new Services_Facebook(); // See: http://wiki.developers.facebook.com/index.php/Authorizing_Applications // Shows all information passed to us via get echo "Get variables:<br />"; print_r($_GET); echo "<br /><br />"; // Shows all information passed to us via post echo "Post variables:<br />"; print_r($_POST); echo "<br /><br />"; // Shows all variables passed to us from the server (probably not needed, but helpful) echo "Server variables:<br />"; print_r($_SERVER); echo "<br /><br />"; // If a session key is passed, then grab it if (!empty($_POST)) { if (!empty($_POST["fb_sig_session_key"])) { $api->sessionKey = $_POST["fb_sig_session_key"]; // This next line is just for debugging echo "Obtained session key: " . $api->sessionKey . "<br />"; echo "This means we may use methods which require a session key.<br /><br />"; } } if (!empty($_POST)) { echo "We have been given post data.<br />"; if (!empty($_POST["fb_sig_canvas_user"])) { $isCanvasUser = true; $uid = $_POST["fb_sig_canvas_user"]; echo "fb_sig_canvas_user says the user is a canvas user.<br />"; echo "Generally speaking, you won't be passed a session key, nor will you be able to<br />"; echo "use methods which need to be signed (so don't be surprised if you didn't get<br />"; echo "'fb_sig_session_key' passed to you).<br />"; echo "It may actually be impossible to see this message unless the surrounding FBML<br />"; echo "requiring that the application be authorized is removed, but this hasn't been<br />"; echo "tested exhaustively.<br />"; } else { $isCanvasUser = false; } if (!empty($_POST["fb_sig_user"])) { $isAddedUser = true; $uid = $_POST["fb_sig_user"]; echo "fb_sig_user says the user is an application user.<br />"; } else { $isAddedUser = false; } if ($isCanvasUser || $isAddedUser) { // We have the uid for the current user, so we can use it to get the user's friends $info = $api->users->getInfo($uid); echo "You are:<br />"; echo (string)$info->user->uid . ": "; echo (string)$info->user->first_name . " "; echo (string)$info->user->last_name . "<br /><br />"; // A list of friend uid's, can also be gotten from $_POST but we wouldn't be able to show a call $uids = $api->friends->get($uid); $fql = 'SELECT uid, first_name, last_name FROM user WHERE uid IN (' . implode(',', $uids) . ')'; $result = $api->fql->query($fql); $friendCount = 0; echo "Here are up to twenty of your friends: <br />"; foreach ($result->user as $user) { if ($friendCount>=20) break; // Print only users who have authorized their data; those who have not will have empty name data if (!empty($user->first_name)&&!empty($user->last_name)) { // Print with uids //echo (string)$user->uid . ": " . (string)$user->first_name . " " . (string)$user->last_name . "<br />"; // Print without uids, for individual user privacy echo (string)$user->first_name . " " . (string)$user->last_name . "<br />"; $friendCount++; } } } } } catch (Services_Facebook_Exception $e) { echo $e->getLastCall() . "<br />"; echo $e->getMessage(); } echo "<br />The page this page is coming back to after adding is:<br />"; echo "http://apps.facebook.com" . $_SERVER['PHP_SELF'] . "&canvas=<br />"; ?> <!-- See: http://wiki.developers.facebook.com/index.php/Authorizing_Applications --> <fb:else> <fb:redirect url="http://www.facebook.com/login.php?v=1.0&api_key=<?php echo Services_Facebook::$apiKey; ?>&next=http://apps.facebook.com<?php echo $_SERVER['PHP_SELF']; ?>&canvas="/> </fb:else> </fb:if-is-app-user>