[Bug 265395] mail/squirrelmail: INBOX does not populate messages after upgrading php 7.4 to php 8.0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265395

--- Comment #2 from MattS <matt@snowtrek.org> ---
(In reply to Zsolt Udvari from comment #1)

I'm a novice programmer, so I'm very hesitant to recommend any changes. My
understanding is that php 8.0 throws a fatal error when trying to do math
functions with a string. This was allowed in php5.6, and gave a warning in
php7.4. Since substr() returns a string, I figured I'd try wrapping it in
intval to return an integer instead so that could be used in the time zone
conversion.

I assume this would continue to work in any php version, but I don't know for
sure. I'm also not sure if there could be a problem with $iTzc being an integer
elsewhere in squirrelmail.

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