PHP setlocale fucks up function

# cat sucks.php<?$loc = setlocale(LC_ALL, 'tr_TR.UTF-8');echo $loc;require_once "include/test.class.php";echo User::isLoggedIn();?># cat include/test.class.php<?class User{        static function isLoggedIn(){                return true;        }}?>Gives:tr_TR.UTF-8Fatal error: Call to undefined method User::isloggedin() in /var/www/sucks.php on line 5System - debian with:# locale -aC...en_US.iso885915en_US.utf8germanPOSIXtr_TR.utf8