[Mediawiki-l] risks in changing the php-version ?

[Brion Vibber]

On 11/14/05, mitderzeit at googlemail.com <mitderzeit at googlemail.com> wrote:
>  are there risks in changing the php-versions from 4xxx to 5xxx and (perhaps
> later back to 4xxx) on a running installation?

PHP 5.1 and 5.0.5 and later will likely encounter many problems with
MediaWiki 1.4.x or 1.3.x; if you're running an old MediaWiki you may
need to upgrade to the current 1.5 release (1.5.2 at the moment).

PHP 5.0.4 and earlier should be ok on the current 1.4. release, but
will disable the default skin on 1.3 due to incompatibilities with the
old PHPTAL theme engine.

Be sure to always run the most recent release within your release
branch at least; for instance the recent PHP 4.4.1 introduced a few
new problems which had to be worked around in 1.5.2/1.4.12/1.3.18.

In general, *as long as you've got compatible versions*, upgrading to
PHP 5 or downgrading to 4 should not cause problems.

-- brion vibber (brion @ pobox.com)