Description:
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PHP 4 end of life == 2007-12-31
so that we no more need compatibility with php4 in php5 ;)
sorry for my bad english :(

Reproduce code:
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; PHP 4.2 and less have an undocumented feature/bug that allows you to
; to initialize a session variable in the global scope, albeit register_globals
; is disabled.  PHP 4.3 and later will warn you, if this feature is used.
; You can disable the feature and the warning separately. At this time,
; the warning is only displayed, if bug_compat_42 is enabled.

session.bug_compat_42 = 1
session.bug_compat_warn = 1

Expected result:
----------------
session.bug_compat_42 = 0
session.bug_compat_warn = 0

Actual result:
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session.bug_compat_42 = 1
session.bug_compat_warn = 1