Why does "use" not work when included in php? - php

Question

I'm updating my apps to work with the new PHP SDK, but I'm having this issue:
I want to do the Facebook stuff in a separate php file to keep things clean.
For example, this is my fb.php page:
<?php
require_once('sdk/autoload.php');
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\Entities\AccessToken;
use Facebook\Entities\SignedRequest;
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookOtherException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphSessionInfo;
// start session
session_start();
// init app with app id and secret
FacebookSession::setDefaultApplication(...,...);
// see if a existing session exists
if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
// create new session from saved access_token
$session = new FacebookSession( $_SESSION['fb_token'] );
// validate the access_token to make sure it's still valid
try {
if ( !$session->validate() ) {
$session = null;
}
} catch ( Exception $e ) {
// catch any exceptions
$session = null;
}
}
// see if we have a session
if ( isset( $session ) ) {
// save the session
$_SESSION['fb_token'] = $session->getToken();
// create a session using saved token or the new one we generated at login
$session = new FacebookSession( $session->getToken() );
//logged in
} else {
//user is not logged in
?>
<script>window.location="...link to login page...";</script>
<?php
exit;
}
A page which uses the Facebook session, could look like this (testing.php):
<?php
require_once('fb.php');
$request = new FacebookRequest( $session, 'GET', '/me' );
$response = $request->execute();
$graphObject = $response->getGraphObject()->asArray();
echo "Welcome, ".$graphObject['first_name'];
This returns this error:
Fatal error: Class 'FacebookRequest' not found
The code works fine when I put use Facebook\FacebookRequest; in testing.php , but I don't want to do that, since that was the point of putting all the Facebook session stuff in a separate fb.php file...
What is the reason for this, and is there a solution how to keep all my Facebook stuff in a separate file?
Thanks!

Answer 1

File in which you are including fb.php is in different scope so can't use that imports.
You have to specify them again.
You can read more about that in PHP manual.