在laravel 5 facebook graph api中找不到Facebook类

Question

I am using facebook graph api in laravel 5.1.I have installed it usnig composer command

composer require facebook/php-sdk-v4

the facebook graph api has been installed but when i create the facebook api object in laravel then it's give me this error

Class 'App\Http\Controllers\Userapp\Facebook\Facebook' not found

it is in this line

$fb = new Facebook\Facebook([

here is my Controller file

<?php namespace App\Http\Controllers\Userapp;
require_once( base_path('vendor/facebook/php-sdk-v4/src/Facebook/autoload.php') );
// Facebook Requires
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\Entities\AccessToken;
use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\HttpClients\FacebookCurl; 

and the function of the controller

public function index()
    {   
        // init app with app id and secret
        $fb = new Facebook\Facebook([
          'app_id' => 'xxxxxxxxxxxxxxx',
          'app_secret' => 'xxxxxxxxxxxxxxxxx',
          'default_graph_version' => 'v2.5',
          //'default_access_token' => '{access-token}', // optional
        ]);


        try {
          // Get the Facebook\GraphNodes\GraphUser object for the current user.
          // If you provided a 'default_access_token', the '{access-token}' is optional.
          $response = $fb->get('/me', '{access-token}');
        } catch(Facebook\Exceptions\FacebookResponseException $e) {
          // When Graph returns an error
          echo 'Graph returned an error: ' . $e->getMessage();
          exit;
        } catch(Facebook\Exceptions\FacebookSDKException $e) {
          // When validation fails or other local issues
          echo 'Facebook SDK returned an error: ' . $e->getMessage();
          exit;
        }

        $me = $response->getGraphUser();
        echo 'Logged in as ' . $me->getName();
    }

kindly help me solving this problem. i will really appreciate that Thanks

Answer 1

Within the index function, you are not in the global scope so that as you call the class as Facebook\Facebook, PHP thinks that you are calling Facebook\Facebook declared in the App\Http\Controllers\Userapp namespace.

Either you need to reference them as globally like below with prepending \.

public function index()
{
    $fb = new \Facebook\Facebook([]);
    // your code
    catch(\Facebook\Exceptions\FacebookResponseException $e)
    // your code
    catch(\Facebook\Exceptions\FacebookSDKException $e)
    // your code
}

Or use the aliases.

use Facebook\Facebook as Facebook;
use Facebook\Exceptions\FacebookResponseException as FacebookResponseException
use Facebook\Exceptions\FacebookSDKException as FacebookSDKException

public function index()
{
    $fb = new Facebook([]);
    // your code
    catch(FacebookResponseException $e)
    // your code
    catch(FacebookSDKException $e)
    // your code
 }