AHMAD ASJAD – احمد اسجد

<a class="btn btn-block btn-social btn-facebook"  onClick="logInWithFacebook()">
	<span class="fa fa-facebook"></span>
	Login with Facebook
</a>

<script>
    logInWithFacebook = function () {
        FB.login(function (response) {
            if (response.authResponse) {
                // Now you can redirect the user or do an AJAX request to
                // a PHP script that grabs the signed request from the cookie.
                jQuery.ajax({
                    url: 'fb-js-login.php',
                    type: 'get',
                    success: function (data) {
                        if (data == 'correct') {
                            location.reload();
                        } else {
                            jQuery('.login-message').html(data);
                            console.log(data);
                        }
                    },
                    error: function (xhr, status, errorThrown) {
                        console.log(xhr);
                    }
                });
 
            } else {
                alert('User cancelled login or did not fully authorize.');
            }
        }, {scope: 'email'});
        return false;
    };
    window.fbAsyncInit = function () {
        FB.init({
            appId: 'your_app_id_goes_here',
            cookie: true, // This is important, it's not enabled by default
            version: 'v2.2'
        });
    };
 
    (function (d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) {
            return;
        }
        js = d.createElement(s);
        js.id = id;
        js.src = "//connect.facebook.net/en_US/sdk.js";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));
</script>

CREATE TABLE `tbl_user` (
  `id` int(11) NOT NULL,
  `first_name` varchar(255) NOT NULL,
  `last_name` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `mobile` varchar(255) NOT NULL,
  `address` longtext NOT NULL,
  `area` varchar(500) NOT NULL,
  `city` varchar(255) NOT NULL,
  `state` varchar(255) NOT NULL,
  `country` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `confirm` varchar(255) NOT NULL,
  `photo` varchar(256) NOT NULL,
  `created_at` date NOT NULL,
  `status` enum('active','inactive') NOT NULL DEFAULT 'inactive',
  `auth_key` text
) ENGINE=InnoDB  DEFAULT CHARSET=latin1;
 
 
ALTER TABLE `register`
 ADD PRIMARY KEY (`id`);

<?php include 'include/conn.php'; ?>
<?php
 
include_once dirname(__FILE__). '/facebook/graph-sdk/src/Facebook/autoload.php';
 
//js-login.php
$fb = new Facebook\Facebook([
    'app_id' => 'Your_app_id_goes_here',
    'app_secret' => 'your_app_secret_goes_here',
    'default_graph_version' => 'v2.2',
        ]);
 
$helper = $fb->getJavaScriptHelper();
 
try {
    $accessToken = $helper->getAccessToken();
} catch (Facebook\Exceptions\FacebookResponseException $e) {
    // When Graph returns an error
    echo 'Graph returned an error: ' . $e->getMessage();
    exit;
} catch (Facebook\Exceptions\FacebookSDKException $e) {
    // When validation fails or other local issues
    echo 'Facebook SDK returned an error: ' . $e->getMessage();
    exit;
}
 
if (!isset($accessToken)) {
    echo 'No cookie set or no OAuth data could be obtained from cookie.';
    exit;
}
 
// Logged in
$_SESSION['fb_access_token'] = (string) $accessToken;
 
try {
    // Returns a `Facebook\FacebookResponse` object
    $response = $fb->get('/me?fields=id,name,email', $_SESSION['fb_access_token']);
} catch (Facebook\Exceptions\FacebookResponseException $e) {
    echo 'Graph returned an error: ' . $e->getMessage();
    exit;
} catch (Facebook\Exceptions\FacebookSDKException $e) {
    echo 'Facebook SDK returned an error: ' . $e->getMessage();
    exit;
}
//All information received from facebook is stored in $user variable
$user = $response->getGraphUser();
 
$email = $user ['email'];
$que = "select * from register where email='$email' AND status='active'";
$run = mysql_query($que);
$count = mysql_num_rows($run);
if ($count > 0) {
    $rst = mysql_fetch_assoc($run);
    $_SESSION ['user_email'] = $email;
    $_SESSION ['userfname'] = $rst ['fname'];
    $_SESSION ['userlogin_id'] = $rst ['id'];      
} else {
	//You also can register the user if he is not a user of your website from the information provided by facebook or simply show a message
    echo "Your are not registered with this website";
}