umask
    (PHP 3, PHP 4 )
umask -- Changes the current umask
Description
int 
umask ( [int mask])
     umask() sets PHP's umask to mask & 0777 and      returns the old umask. When PHP is being used as a server module,      the umask is restored when each request is finished.     
     umask() without arguments simply returns the      current umask.