Description:
------------
I am experiencing trouble setting the locale (with setlocale(LC_ALL, ...)) in my 
code. With PHP 5.4, it always worked as expected, with 5.5 it appears that the 
locale has been changed, but localeconv() is still returning old values and 
functions like printf('%f') do not behave as expected.

I have disabled the new Opcache, but the random behaviour persisted. I can't tell 
when it happens and why it sometimes doesn't work. It seems (to me) that there is 
some kind of threading problem, as I can have the same code in different browser 
tabs and get different results.

I am using PHP 5.5.0 VC11 TS x86 on Windows 7 x64, loaded as a module into my 
Apache 2.4.3, which is running as a service.

Test script:
---------------
<?php

function test($locale, $value) {
  $newlocale = setlocale(LC_ALL, $locale);
  $conv      = localeconv();
  $sep       = $conv['decimal_point'];

  printf("%s\n--------------------------\n", $newlocale);
  printf(" sep: %s\n", $sep);
  printf("  %%f: %f\n", $value);
  printf("  %%F: %F\n", $value);
  printf("date: %s\n", strftime('%x'));
  printf("\n");
}

test('german', 3.41);
test('english', 3.41);
test('french', 3.41);
test('german', 3.41);

Expected result:
----------------
German_Germany.1252
--------------------------
 sep: ,
  %f: 3,410000
  %F: 3.410000
date: 10.07.2013

English_United States.1252
--------------------------
 sep: .
  %f: 3.410000
  %F: 3.410000
date: 7/10/2013

French_France.1252
--------------------------
 sep: ,
  %f: 3,410000
  %F: 3.410000
date: 10/07/2013

German_Germany.1252
--------------------------
 sep: ,
  %f: 3,410000
  %F: 3.410000
date: 10.07.2013


Actual result:
--------------
German_Germany.1252
--------------------------
 sep: .
  %f: 3.410000
  %F: 3.410000
date: 10.07.2013

English_United States.1252
--------------------------
 sep: .
  %f: 3.410000
  %F: 3.410000
date: 7/10/2013

French_France.1252
--------------------------
 sep: .
  %f: 3.410000
  %F: 3.410000
date: 10/07/2013

German_Germany.1252
--------------------------
 sep: .
  %f: 3.410000
  %F: 3.410000
date: 10.07.2013