PHP - Facebook Login
We can use Facebook login to allow the users to get access into the websites. This page will explain you about login with facebook PHP SDK.
Login With Facebook
- Need to go https://developers.facebook.com/apps/ and click on add a new group button to make the app ID.
- Choose Website
- Give an app name and click on Create New Facebook App ID
- Click on Create app ID
- Click on Skip Quick Test
On Final stage, it will show as below shown image.
fbconfig.php file overview
- Now download zip from here
- Now open fbconfig.php file and add you app ID and app Secrete
FacebookSession::setDefaultApplication( 'your app ID','App Secrete ' );
// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper('You web address' );
Finally fbconfig.php file as shown below −
<?php
session_start();
// added in v4.0.0
require_once 'autoload.php';
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\Entities\AccessToken;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\HttpClients\FacebookHttpable;
// init app with app id and secret
FacebookSession::setDefaultApplication( '496544657159182','e6d239655aeb3e496e52fabeaf1b1f93' );
// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper('http://www.itboyharsh.com/' );
try {
$session = $helper->getSessionFromRedirect();
}catch( FacebookRequestException $ex ) {
// When Facebook returns an error
}catch( Exception $ex ) {
// When validation fails or other local issues
}
// see if we have a session
if ( isset( $session ) ) {
// graph api request for user data
$request = new FacebookRequest( $session, 'GET', '/me' );
$response = $request->execute();
// get response
$graphObject = $response->getGraphObject();
$fbid = $graphObject->getProperty('id'); // To Get Facebook ID
$fbfullname = $graphObject->getProperty('name'); // To Get Facebook full name
$femail = $graphObject->getProperty('email'); // To Get Facebook email ID
/* ---- Session Variables -----*/
$_SESSION['FBID'] = $fbid;
$_SESSION['FULLNAME'] = $fbfullname;
$_SESSION['EMAIL'] = $femail;
/* ---- header location after session ----*/
header("Location: index.php");
}else {
$loginUrl = $helper->getLoginUrl();
header("Location: ".$loginUrl);
}
?>
Login page Overview
Login page is used to login into FB
<?php
session_start();
session_unset();
$_SESSION['FBID'] = NULL;
$_SESSION['FULLNAME'] = NULL;
$_SESSION['EMAIL'] = NULL;
header("Location: index.php");
?>
Index.php
Index page is as shown below.
<?php
session_start();
?>
<html xmlns:fb = "http://www.facebook.com/2008/fbml">
<head>
<title>Login with Facebook</title>
<link
href = "http://www.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css"
rel = "stylesheet">
</head>
<body>
<?php if ($_SESSION['FBID']): ?> <!-- After user login -->
<div class = "container">
<div class = "hero-unit">
<h1>Hello <?php echo $_SESSION['USERNAME']; ?></h1>
<p>Welcome to "facebook login" tutorial</p>
</div>
<div class = "span4">
<ul class = "nav nav-list">
<li class = "nav-header">Image</li>
<li><img src = "https://graph.facebook.com/<?php
echo $_SESSION['FBID']; ?>/picture"></li>
<li class = "nav-header">Facebook ID</li>
<li><?php echo $_SESSION['FBID']; ?></li>
<li class = "nav-header">Facebook fullname</li>
<li><?php echo $_SESSION['FULLNAME']; ?></li>
<li class = "nav-header">Facebook Email</li>
<li><?php echo $_SESSION['EMAIL']; ?></li>
<div><a href="logout.php">Logout</a></div>
</ul>
</div>
</div>
<?php else: ?> <!-- Before login -->
<div class = "container">
<h1>Login with Facebook</h1>
Not Connected
<div>
<a href = "fbconfig.php">Login with Facebook</a>
</div>
<div>
<a href = "http://www.itboyharsh.com"
title = "Login with facebook"> </a>
</div>
</div>
<?php endif ?>
</body>
</html>
It will produce the result here. Before trying this example, please logout your face book account in your browser.
Logout Facebook
Below code is used to logout facebook.
<?php
session_start();.
session_unset();
$_SESSION['FBID'] = NULL;
$_SESSION['FULLNAME'] = NULL;
$_SESSION['EMAIL'] = NULL;
header("Location: index.php");
?>
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