For no good reason, I'm running the next version pre-release software on this server. It ends up running about 100 updates a day. Today's update seems to have caused problems with this (and probably other) software. 

In particular, the base PHP version was updated to v7.4. This software is evidently not compatible, as there are warning messages throughout. I've tried many of the suggestions to suppress the messages, and also have edited out some of the warnings. For example, apparently in v7.3 you could access an array element using curly braces, such as array{0}, but that generates a deprecation warning on the site, so I've corrected them (when I find them) to use proper array notation, such as array[0].

There's a bunch of sloppiness in this (and by extension PHP), but I'll get through it.