Working with Facebook SDK Permissions.

The tutorial contains lib directory contains facebook sdk and database config files with PHP files.

lib
-- facebook.php  //Facebook SDK
-- base_facebook.php 
-- fbconfig.php //Facebook Application configuration
-- db.php //Database connection 
fblogin.php
home.php
status_update.php

Database
Sample database users table columns id,facebook_id, name, email etc..

CREATE TABLE users
(
id INT PRIMARY KEY AUTO_INCREMENT,
facebook_id INT(20),
name VARCHAR(200),
email VARCHAR(200),
gender VARCHAR(10),
birthday DATE,
location VARCHAR(200),
hometown VARCHAR(200),
bio TEXT,
relationship VARCHAR(30),
timezone VARCHAR(10),
access_token TEXT
);

Facebook Application

You have to create a application. Facebook will provide you app id and app secret id, just replace in the following code. 
fbconfig.php

<?php
$facebook_appid='App ID';
$facebook_app_secret='App Secret';
$facebook = new Facebook(array(
'appId' => $facebook_appid,
'secret' => $facebook_app_secret,
));
?>

fblogin.php
Facebook log in request for user details. Just a take a look at the scope, here requesting email and birthday. Storing $userdata value into session$_SESSION['userdata']

<?php
require 'lib/db.php';
require 'lib/facebook.php';
require 'lib/fbconfig.php';

$user = $facebook->getUser();
if ($user)
{
$logoutUrl = $facebook->getLogoutUrl();
try 
{
$userdata = $facebook->api('/me');
} 
catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
$_SESSION['facebook']=$_SESSION;
$_SESSION['userdata'] = $userdata;
$_SESSION['logout'] = $logoutUrl;
//Redirecting to home.php
header("Location: home.php"); 
}
else
{ 
$loginUrl = $facebook->getLoginUrl(array(
 'scope' => 'email,user_birthday'
));
echo '<a href="'.$loginUrl.'">Login with Facebook</a>';
}
?>