Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/b14978ddac6465d4#
Here are list of incompatible changes that were made in PHP 5.4: http://lv.php.net/manual/en/migration54.incompatible.php
Here are ones, that we need to address in In-Portal:
In the date and time extension, the timezone can no longer be set using the TZ environment variable. Instead you have to specify a timezone using the date.timezone php.ini option or date_default_timezone_set() function. PHP will no longer attempt to guess the timezone, and will instead fall back to "UTC" and issue a
E_WARNING.
If user has specified his own timezone we use putenv('TZ=user_timezone'); code, that based on above will no longer work.
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