PHP Facebook API - Email return null - php

Question

I have code like this:
$helper = new FacebookRedirectLoginHelper('http://MyAwesomeWebsite.com/' );
try {
$session = $helper->getSessionFromRedirect();
} catch( FacebookRequestException $ex ) {
echo print_r($ex);
} catch( Exception $ex ) {
echo print_r($ex);
}
if ( isset( $session ) ) {
$request = new FacebookRequest( $session, 'GET', '/me?locale=en_US&fields=name,email' );
$response = $request->execute();
$graphObject = $response->getGraphObject();
$fbid = $graphObject->getProperty('id'); // To Get Facebook ID
$fbfullname = $graphObject->getProperty('name'); // To Get Facebook full name
$femail = $graphObject->getProperty('email'); // To Get Facebook email ID
}
But every time $femail is null. Why? What I'm doing wrong?

Answer 1

When you log in the user, you have to pass along the email permission in the scope parameter.
So when you call your helper, also initialise a $permissions array:
$helper = new FacebookRedirectLoginHelper('http://MyAwesomeWebsite.com/' );
$permissions = ['email', 'public_profile'];
There should be $helper->getLoginUrl call in somewhere in your code. In that call you should pass the $permissions variable as the second parameter:
$loginUrl = $helper->getLoginUrl($placeYourCallbackURLHere, $permissions);
That asks the user explicitly for a permission to get the user's email. Note that the email can also be empty, if the user has:
Registered to Facebook via phone number (does not have email address in Faceebook)
Selected that they do not want to provide the email address at the login prompt.