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PHP 7.3 was released Dec 6, 2018.

Confirm PHP 7.3 compatibity, create tasks in this issue or other related ones if they are found, then update https://docs.civicrm.org/sysadmin/en/latest/requirements/ to indicate PHP 7.3 is supported.

There are a number of Backward Incompatible Changes in 7.3 that may affect us: http://php.net/manual/en/migration73.incompatible.php

In particular:

1. continue statements targeting switch control flow structures will now generate a warning

There don't seem to be that many places where this might be an issue: ``grep -R -n -i -A5 -B5 "continue" ./* | grep -E 'continue|switch' | more

1. Strict Interpretation of Integer String Keys on ArrayAccess

Whack-a-mole efforts may be needed.

I think if enough reports of successful use of 7.3 are found then we should go ahead and update the documentation. I will encourage dev chat channel to weigh in here.