Facebook PHP SDK V4 - Logging In and Get Name of User

Facebook recently updated the PHP SDK. And so the current version is version 4.0. And things have changed a lot from the previous version. It is now completely object oriented and is kinda easier when compared to the earlier version which was 3.2.3. I already made a video on how to Login To Facebook and Get the name of the user using PHP SDK V 3.2.3 and so in this post we will be seeing on how to do the same using this version. Lets get started.

Downloading the Facebook PHP SDK :

And so it is similar to download the PHP SDK and its just like the last version. So get headed to the link below to download the PHP SDK.

DOWNLOAD FACEBOOK PHP SDK V4

Writing Down The Code :

And so the next part is to code the stuff. The first thing that you need to do is that you need to extract the downloaded file and you need to copy the folder named Facebook inside the src folder. Copy that folder to the root of your project. And then write the following piece of code inside your index.php file.

<?php

session_start();

include 'Facebook/FacebookSession.php';

include 'Facebook/FacebookRedirectLoginHelper.php';

require_once( 'Facebook/FacebookRequest.php' );

require_once( 'Facebook/FacebookResponse.php' );

require_once( 'Facebook/FacebookSDKException.php' );

require_once( 'Facebook/FacebookRequestException.php' );

require_once( 'Facebook/FacebookAuthorizationException.php' );

require_once( 'Facebook/GraphObject.php' );

require_once( 'Facebook/GraphUser.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\GraphUser;

FacebookSession::setDefaultApplication('APP_ID', 'APP_SECRET');

$helper = new FacebookRedirectLoginHelper('http://cyberfreax.com/test/index.php');

$session = $helper->getSessionFromRedirect();

if($session != NULL){

echo "Logged In !<br>";

}

else{

echo '<a href="' . $helper->getLoginUrl() . '">Login</a>';

}

?>

And so in this code what we basically do is that we just include the Facebook PHP SDK files in our index page. Unlike the earlier version of the Facebook PHP SDK in this version Facebook has separated the different functions into different files so that you don't need to includes unnecessary functions in all files. And moreover it uses namespaces.

We are getting the Facebook session using the default function. If the session is not available then we prompt the user to login by displaying the Login link. And if the session is set it would mean that the user is logged in. And so we are at first just displaying the name of the user. But we would want to display the name of the user too. And so add the following piece of code right below the echo "Logged In !<br>"; line.

$request = new FacebookRequest($session, 'GET', '/me');

$response = $request->execute();

$graph = $response->getGraphObject(GraphUser::className());

echo $graph->getName();

Instead of the above piece of code you can also combine them into a couple of lines. You can add something like the following :

$request = (new FacebookRequest(

      $session, 'GET', '/me'

    ))->execute()->getGraphObject(GraphUser::className());

    echo $user_profile->getName();

But the problem with the above code is that it works for only PHP version 5.3 and above. So make sure that you have a suitable version of PHP before running the above code.






And so that is it. You can now easily add a Login with Facebook link to your website using the latest version of Facebook PHP SDK. Happy Coding :)

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