facebook api“语法错误，意外'使用'”

Hello I am trying to use the facebook api to verify a access token and get the user data like email etc..

However when I test it I get this Parse error: syntax error, unexpected 'use' (T_USE).

Here is the code I am using currently.

        require_once( getcwd().'/Facebook/FacebookSession.php' );
        require_once( getcwd().'/Facebook/FacebookRedirectLoginHelper.php' );
        require_once( getcwd().'/Facebook/FacebookRequest.php' );
        require_once( getcwd().'/Facebook/FacebookResponse.php' );
        require_once( getcwd().'/Facebook/FacebookSDKException.php' );
        require_once( getcwd().'/Facebook/FacebookRequestException.php' );
        require_once( getcwd().'/Facebook/FacebookAuthorizationException.php' );
        require_once( getcwd().'/Facebook/GraphObject.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\GraphUser;


        FacebookSession::setDefaultApplication('My App ID', 'My Secret');

        //   Use one of the helper classes to get a FacebookSession object.
        //   FacebookRedirectLoginHelper
        //   FacebookCanvasLoginHelper
        //   FacebookJavaScriptLoginHelper
        // or create a FacebookSession with a valid access token:
        $session = new FacebookSession('My Access Token');

        try {
            $me = (new FacebookRequest(
                $session, 'GET', '/me'
            ))->execute()->getGraphObject(GraphUser::className());
            echo $me->getName();
        } catch (FacebookRequestException $e) {
            // The Graph API returned an error
        } catch (\Exception $e) {
            // Some other error occurred
        }

Any Ideas on how to fix this error? I never used "use" before and I have read the php documentation for it but i still can't figure it out.

Well thanks everybody I finally got it working, turns out you have to make sure that the code below is not within a function like ceejayoz said. I just moved it outside my code igniter model class and now it works, thanks.

//We need to load the Facebook api library
require_once( getcwd().'/facebook-php-sdk-v4-4.0-dev/autoload.php' );
require_once( getcwd().'/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookSession.php' );
require_once( getcwd().'/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookRedirectLoginHelper.php' );
require_once( getcwd().'/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookRequest.php' );
require_once( getcwd().'/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookResponse.php' );
require_once( getcwd().'/Facebook/FacebookSDKException.php' );
require_once( getcwd().'/Facebook/FacebookRequestException.php' );
require_once( getcwd().'/Facebook/FacebookAuthorizationException.php' );
require_once( getcwd().'/Facebook/GraphObject.php' );

//Setup the facebook api for Facebook Validate
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\GraphUser;

These lines are invalid

use Facebook\FacebookSession';
use Facebook\FacebookRedirectLoginHelper';

Correct is:

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;

The solution is simple. Put your use statements outside { }.

For example, the following is incorrect:

<?php
if($_GET["page"]=="index.php"){
        use Facebook\FacebookSession;
}
?>

The following is correct:

<?php
use Facebook\FacebookSession;
if($_GET["page"]=="index.php"){
   ...
}
?>