email is not saved in database from Facebook id in php - php

Question

My email id is not stored in database. I want to store details of Facebook user in my database. Actually, I have login page in which, user can also login with Facebook but problem is that i get all details except email. I need store the email id also in database.Please help me.any help is appreciate.
here is my code...
<?php
require 'facebook/facebook.php';
require 'config/fbconfig.php';
require 'config/functions.php';
$facebook = new Facebook(array(
'appId' => APP_ID,
'secret' => APP_SECRET,
));
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
}catch (FacebookApiException $e){
error_log($e);
$user = null;
}
if(!empty($user_profile )){
# User info ok? Let's print it (Here we will be adding the login and registering routines)
$username = $user_profile['name'];
$uid = $user_profile['id'];
echo $email = $user_profile['email'];
$user = new User();
$userdata = $user->checkUser($uid, 'facebook', $username,$email,$twitter_otoken,$twitter_otoken_secret);
if(!empty($userdata)){
session_start();
$_SESSION['id'] = $userdata['id'];
$_SESSION['oauth_id'] = $uid;
$_SESSION['username'] = $userdata['username'];
$_SESSION['email'] = $email;
$_SESSION['oauth_provider'] = $userdata['oauth_provider'];
header("Location: home.php");
}
}else{
# For testing purposes, if there was an error, let's kill the script
die("There was an error.");
}
}else{
# There's no active session, let's generate one
$login_url = $facebook->getLoginUrl(array( 'scope' => 'email'));
header("Location: " . $login_url);
}

Answer 1

It is just a suggestion.
Sometimes If user will not give permission access his email id in Facebook. at that time you will not get email id of that user.
So in that scenario you can store user email as 'userid#facebook.com'.
userid is also unique in facebook for every user. So you will get unique email id for every user.

Answer 2

Replace the below line :
$user_profile = $facebook->api('/me');
with the following code:
$user_profile = $facebook->api('/me?fields=id,name,first_name,last_name,gender,locale,timezone,email');