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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
PHP versions 4.2.3 and lower have an undocumented feature/bug that allows you to initialize a session variable in the global scope, albeit register_globals is disabled. PHP 4.3.0 and later will warn you, if this feature is used, and if session.bug_compat_warn is also enabled. This feature/bug can be disabled by disabling this directive.
I don't think it will cause any harm, but if you want, change your script.
Best of luck! ;)
Woah, just found the problem. I kept putting in die statements in my code starting at the end and moving up until I isolated the line that triggered the error (error was being shown at end but actually being triggerd somewhere in the middle). I was setting a certain variable, non global, non session. I re-named the variable and the error goes away. I'm using PEAR so my guess is there is an identical variable in PEAR in the global scope or something. Jeesh.