How to redirect to users from Facebook page to another page

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Javascript

Java

PHP

I have 3 pages. config.php, login.php and facebook_login.php.I set redirect url in config.php. When users logged in via facebook the pages redirect to home. Because I have multiple login button into pages when users come to login.php depends on what button they click on I would like to redirect users different pages from login.php to facebook page. Such as to index.page , admin.page or product page etc. How can I redirect users in the light what I have just told?

PS:Array config.php or $Config['return_url']) in facebook_login.php might be problem.

thanks..

**config.php**

 "https://www.example.com/login",    

    "return_url" => "https://www.example.com/home",     

"facebook" => array(
        "Statu" => 1, 
        "app_id" => "",
        "app_secret" => "",     
        "default_graph_version" => "v2.5",      
     ),
)

?>
 **login.php**

facebook<a>";

?>
**facebook_login.php** back-end

get('me?fields=id,name,email';

   $accessToken);

   $UserData = $UserData->getGraphNode()->asArray();

   $data = array();

   $data['oauth'] = "facebook"

   $data['uid'] = $UserData['id'];
 
   $data['name'] = $UserData['name'];

   $_SESSION['loginer'] = array("uid" => $data['uid'], "name" => $data['name'], "oauth" => 

   $data['oauth']);
 
   unset($_SESSION['FBRLH_state']);

   header("location: ".$Config['return_url']);

   exit();

} 

?;

What I have tried:

if (!isset($_SESSION['loginer'])) {

header("location: product.php");