Sign in with Facebook notes

 Sign in with Facebook notes

•  visit Facebook for Developers website. 
•  Then login through your Account.
• Click on Get Started and verify your account.
• Now , We have create new app for that click on Create App button.
• after that , select Facebook login  through  web .
•  Insert the sdk code in web page and place your app id in code properly .
• download facebook sdk in your project folder root. using command composer require facebook/graph-sdk
• Create config.php file
• Add following code in config.php  file

<?php

//start session on web page

session_start();  

$fb =  new \Facebook\Facebook([

    'app_id' => '379937770193328',

    'app_secret' => '969eba7d010dc91ca38213ef3ba6fb56',

    'default_graph_version' => 'v3.0'

]);

?> 

• in index.php file

include('config.php');

// FaceBook Login Code Start

$facebook_output = '';

$facebook_helper = $facebook->getRedirectLoginHelper();

if (isset($_GET["code"])) {

  

    if (isset($_SESSION['access_token'])) {

        $access_token = $_SESSION['access_token'];

    }

    else{

        $access_token = $facebook_helper->getAccessToken();

        $_SESSION['access_token'] = $access_token;

        $facebook->setDefaultAccessToken($_SESSION['access_token']);

    }

    $graph_response = $facebook->get("/me?fields=name,email",$access_token);

    $facebook_user_info = $graph_response->getGraphUser();

    if(!empty($facebook_user_info['id']))

    {

        $_SESSION['image'] = 'http://graph.facebook.com/'.$facebook_user_info['id'].'/picture';

    }

    if(!empty($facebook_user_info['name']))

    {

        $_SESSION['name'] = $facebook_user_info['name'];

    }

    if(!empty($facebook_user_info['email']))

    {

        $_SESSION['email'] = $facebook_user_info['email'];

    }

}

else{

      $facebook_permissions = ['email'];

      $facebook_login_url = $facebook_helper->getLoginUrl('http://localhost/coretechtive/index.php',

      $facebook_permissions);

      $facebook_login_url = '<a href="'.$facebook_login_url.'"><i class="display-flex-center zmdi zmdi-facebook"></i></a>';

}

// Facebook Login code End

 <li><?php 

                                if (isset($facebook_login_url)) {

                                    echo $facebook_login_url;

                                }

                                else {

                                    header('Location:home.php');

                                }

                                ?></li>