If you're coding an addition to vB3 on PHP 5, look out for errors relating to not defining $specialtemplates, $phrasegroups, or the other initialization variables. Even one can flood the page with errors as I found out due to a vBMS bug report (I run everything on PHP 4 like almost everybody else so never encountered the error).
Also take special care when modifying an argument passed to a function because all non-primitives in PHP 5 are passed by reference, unlike in PHP 4 where they're by value.
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