Some problem with code php. Page don't remember my authorize.

I have a problem with page - This page have some code, that block page’s content. And after login/pas i must see - Hello World (page’s content), but after login i see protect form again. I test this code on other hosting and it work perfect - What could it be?

My droplet - Ubuntu 14.04 x64 with

Login - test Password - test

  $old_ua = @ini_set('user_agent', 'glopart-subscription-2');
  $response = @file(""
  if ($response !== false) {
   if (count($response)>1 || $response[0] != 'true') {
    header('Content-Type: text/html; charset=utf-8');
    die(implode("", $response));
  } else die('Не удалось запросить внешний сервер');
  @ini_set('user_agent', $old_ua);

Hello world

Thanks for any help!

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According to the php documentation on file(), you won’t be able to use it on URLs if fopen wrappers are disabled. Try using file_get_contents() instead:

$response = @file_get_contents(""