Drop support for PHP4

Hi.

The fifth project goal states: "SquirrelMail will maintain an architecture
that will flex to the needs of a variety of system administrators, server
configurations, and web browsers while maintaining efficiency and speed."
[1]

It's this goal that has kept us at keeping support for PHP 4 for a long
time. Personally I don't want to bother with PHP 4 anymore and I don't
have any way to test my code for that platform. I haven't looked at all
distributions, but:

The oldest version supported by the PHP team is 5.3.10. [2]
The oldest version in Debian is 5.2.6. [3]
The oldest version in Ubuntu is 5.2.4. [4]

I wasn't able to find any recent reports about market shares, so I don't
know anything about versions in practical use.

According to our documentation, we're supporting PHP 4.1.0. [5]
What should our supported version be? I'm personally voting for 5.2.4
unless anyone of you can find a major distro that has lower standards.
I don't get any good arguments here, I'm going to change all code I touch
to PHP 5.2.

Objections? Comments?

Sincerely,
Fredrik

[1] http://squirrelmail.org/docs/devel/devel-1.html
[2] http://en.wikipedia.org/wiki/PHP#Release_history
[3]
http://packages.debian.org/search?suite=all&section=all&arch=any&searchon=names&keywords=php5
[4]
http://packages.ubuntu.com/search?suite=all&section=all&searchon=names&keywords=php5
[5] http://squirrelmail.org/docs/admin/admin-1.html#ss1.1


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