Facebook login not working PHP API

Question

This is my code (App id and App secret are ok):

session_start();

require_once( 'Facebook/FacebookSession.php' );
require_once( 'Facebook/FacebookRedirectLoginHelper.php' );
require_once( 'Facebook/FacebookRequest.php' );
require_once( 'Facebook/FacebookResponse.php' );
require_once( 'Facebook/FacebookSDKException.php' );
require_once( 'Facebook/FacebookRequestException.php' );
require_once( 'Facebook/FacebookAuthorizationException.php' );
require_once( 'Facebook/GraphObject.php' );
require_once( 'Facebook/HttpClients/FacebookCurl.php' );
require_once( 'Facebook/HttpClients/FacebookCurlHttpClient.php' );
require_once( 'Facebook/HttpClients/FacebookHttpable.php' );

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\FacebookHttpable;
use Facebook\FacebookCurlHttpClient;
use Facebook\FacebookCurl;

FacebookSession::setDefaultApplication('App_id', 'App_secret');

The error I get is :

Fatal error: Interface 'Facebook\\HttpClients\\FacebookHttpable' not found in /home/superwed/public_html/HS/Facebook/HttpClients/FacebookCurlHttpClient.php on line 33

Which is very wierd because everywhere I checked everything is defined ok.

Answer 1

You need to require Facebook/HttpClients/FacebookHttpable.php before Facebook/HttpClients/FacebookCurlHttpClient.php because the latter depends on the former.

Edit: so this Q/A can be helpful to others, you will likely save many a headache by forgoing the require statements and using Composer which has its own autoloader function and is recommended in Facebook's PHP SDK guide . Alternatively, you could write your own autoloader.