Description:
------------
register_shutdown_function() is not correct work with fsockopen() only for windows.
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Reproduce code:
---------------
<?php
set_time_limit(5);
function Shutdown()
  {
  touch('c:\\qwe.txt');
  }
register_shutdown_function('Shutdown');
while (true)
  {
  $fp = fsockopen('dawjadlhi.ru', 80, $e, $en, 5);
  fclose($fp); 
  }
?>

Expected result:
----------------
Fatal error: Maximum execution time of 5 seconds exceeded in h:\home\url_checker\www\1.php on line 10


Actual result:
--------------
Fatal error: Maximum execution time of 5 seconds exceeded in h:\home\url_checker\www\1.php on line 10

!!!!!----------------------------------------
Fatal error: Maximum execution time of 5 seconds exceeded in h:\home\url_checker\www\1.php on line 3
!!!!!----------------------------------------