Login with Facebook and Twitter

Database
Sample database users table columns id, email, oauth_uid, oauth_provider and username.

CREATE TABLE users
(
id INT PRIMARY KEY AUTO_INCREMENT,
email VARCHAR(70), 
oauth_uid VARCHAR(200),
oauth_provider VARCHAR(200),
username VARCHAR(100), 
twitter_oauth_token VARCHAR(200), 
twitter_oauth_token_secret VARCHAR(200) 
);

The tutorial contains three folders called facebook,twitter and config with PHP files.

facebook //Facebook OAUTH library 
twitter //Twitter OAUTH library 
config
-- functions.php 
-- dbconfig.php //Database connection 
-- fbconfig.php //Facebook API connection
-- twconfig.php //Twitter API connection
index.php
home.php
login-twitter.php
login-facebook.php
getTwitterData.php

Facebook Setup

You have to create a application. Facebook will provide you app id and app secret id, just modify following code 
fcconfig.php

<?php
define('APP_ID', 'Facebook APP ID');
define('APP_SECRET', 'Facebook Secret ID');
?>

Twitter Setup

Create a twitter application click here. Some like Facebook Twitter provide you consumer key amd consumer secret key using these modify following code.
twconfig.php

<?php
define('YOUR_CONSUMER_KEY', 'Twitter Key');
define('YOUR_CONSUMER_SECRET', 'Twitter Secret Key');
?>

dbconfig.php
Database configuration file. 

<?php
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'User Name');
define('DB_PASSWORD', 'Password');
define('DB_DATABASE', 'DATABASE');
$connection = mysql_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD) ordie(mysql_error());
$database = mysql_select_db(DB_DATABASE) or die(mysql_error());
?>

login-twitter.php
In root directory find out the below line at login-twitter.php code and replaceyourwebsite. 

$request_token = $twitteroauth->getRequestToken('http://yourwebsite.com/getTwitterData.php');

index.php
If you want to modify your web project existing login or index pages, just use following code. 

<?php
session_start();
if (isset($_SESSION['id'])) {
// Redirection to login page twitter or facebook
header("location: home.php");
}
if (array_key_exists("login", $_GET)) 
{
$oauth_provider = $_GET['oauth_provider'];
if ($oauth_provider == 'twitter')
{
header("Location: login-twitter.php");
}
else if ($oauth_provider == 'facebook')
 {
header("Location: login-facebook.php");
}
}
?>
//HTML Code
<a href="?login&oauth_provider=twitter">Twitter_Login</a>
<a href="?login&oauth_provider=facebook">Facebook_Login</a>

If any queries please comment here. 

Thanks,

from Srinivas Tamada