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1 <?php
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2
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3 /**
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4 * Logging Users out of your App
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5 *
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6 * @author Xavier Barbosa
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7 * @since 13 February, 2013
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8 * @link https://developers.facebook.com/docs/howtos/login/server-side-logout/
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9 **/
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10
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11 use Mute\Facebook\App;
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12
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13 /**
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14 * Default params
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15 **/
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16
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17 $app_id = "YOUR_APP_ID";
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18 $app_secret = "YOUR_APP_SECRET";
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19 $my_url = "YOUR_LOGOUT_URL";
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20
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21 session_start();
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22
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23 /**
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24 * The process
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25 **/
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26
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27 $app = new App($app_id, $app_secret);
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28
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29
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30 $code = $_REQUEST["code"];
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31
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32 if($_SESSION['state'] && ($_SESSION['state'] === $_REQUEST['state'])) {
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33 $params = $app->getOAuth()->getAccessToken($code);
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34 $_SESSION['access_token'] = $params['access_token'];
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35
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36 $user = $app->get('me', array(
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37 'access_token' => $params['access_token'],
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38 ));
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39 echo("Hello " . $user->name);
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40
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41 // Logout button code added below
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42 echo "<br><a href='logout.php'>Click to log out</a>";
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43 }
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44 else {
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45 echo("The state does not match. You may be a victim of CSRF.");
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46 die;
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47 }
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48
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49 $token = $_SESSION["access_token"];
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50 if($token) {
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51 $result = $app->delete('me/permissions', array(
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52 'access_token' => $token,
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53 ));
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54 if($result) {
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55 session_destroy();
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56 echo "User is now logged out.";
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57 }
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58 } else {
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59 echo("User already logged out.");
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60 }
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