session_register в php 4.4.0

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session_register в php 4.4.0

php 4.4.0
System FreeBSD mail.bonustravel.ru 5.4-STABLE FreeBSD 5.4-STABLE #0: Tue Jul 26 14:08:30 MSD 2005 kilka@fw:/usr/obj/usr/src/sys/GENERIC i386
Build Date Aug 30 2005 13:50:14

когда пытаюсь зарегистрировать переменную в сессии
session_register('user');

выдается сообщение

Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

из-за чего?
 
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