PHP - Facebook Login


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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.

facebook

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.tutorialspoint.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.tutorialspoint.com"  
                  title = "Login with facebook">More information about Tutorialspoint</a>
            </div>
         </div>
         
      <?php endif ?>
      
   </body>
</html>

It will produce the result. Before trying this example, please logout your face book account in your browser.

Facebook Login

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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