We have been doing many upgrades today. The issue is not a change in the php configuration, but a change in the vBulletin error handler. I think there is a bug in it - did not have time to explore it further, I just swapped back the old error handling code - which makes it ignore the settings in display_error.
Of course, these warnings show issues you should take care of, but they were there also before you installed 4.2.2, are not immediately critical things, usually, AND should not be shown if display_errors is set to off.
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