php - Error: Cannot redeclare class Facebook -

Like many others, I'm having the following error while using the default facebook.php file: < Pre> Fatal Error: Class federation can not be reclassed in class 160: 160: / wamp \ www \ symfony \ src \ acme \ mainbundle \ controller \ facebook.php

The end of the class declaration in Facebook.php

Here is my code:

  need_once ("Facebook.php"); $ Config = array (); $ Config ['appId'] = '479914672022732'; $ Config ['appId'] = 'd451285c1c38126710980d2b7f2b43b4'; // Everything works fine so far This causes the error $ Facebook = new Facebook ($ config);   
 How can I fix this error?  
 Whatever I have tried:  
 It has been ensured that there are no other functional classes in the project  
 changing need_once, include_once, etc. .  
 If a statement is not required to use a file or to make a Facebook verb, then it already exists  
 research:  
  
 As well as many other posts, but they were related to framework such as Dropl, Zend, WordPress, etc.  
 What I have learned:  
 A good way to use Facebook Fashion SDK is by using a composer to get it into the project. Then, when defining the Facebook verb variable, be sure to use backslash, so its:  
  $ facebook = new / facebook ($ config);    
 
 
 Why try this if a bundle does this for you?  
 Check: