Go to the Admin Control Panel page and you will see were it lists what php your site is currently running on in the Welcome to the vBulletin Admin Control Panel block.
I just did an upgrade to 4.2.3 and it worked ok. You will more than likely get an error with the cms or blog stuff but just start the upgrade again and it will continue on were it left off. You can also remove the show no error code at the top of the config file if you added it as it is no longer needed now that they have it up to snuff for the newer php protocols.
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