[KimR]

Thanks! I looked for the big, long thread and, after the first 200 or so posts with people complaining that vBulletin really ought to fix the software to work with PHP 5.4 and why, why, why-eee won't you? I decided to go with the downgrade.

It's fairly easy on CentOS. Start with the command (run as root or sudo):

yum downgrade php php-common php-cli php-api php-devel

If you've installed PHP from the Remi repo (as I did) you'll get a lot of dependency errors. Just keep adding the problem packages to the end of the command.

For example, if the error looks like this:

Error: Package: php-odbc-5.4.11-1.el6.remi.x86_64 (@remi)
Requires: php-pdo(x86-64) = 5.4.11-1.el6.remi


The command above looks like this:

yum downgrade php php-common php-cli php-api php-devel php-odbc

Keep adding the packages that show up with errors until the yum downgrade command stops complaining.

Thanks for your help. I think my vBulletin is all better now.