[Bug 1907177] Re: Please remove php8.0 from Ubuntu 21.04

[Bryce Harrington]

In Ubuntu we focus on supporting a single php version in a given
release, and for hirsute (21.04) our focus is to stay with php7.4.
Debian policy here differs, which is why php8 is available there.

When transitioning to a new version of php, the entire php stack needs
to be rebuilt against that version, and all test cases re-run and
validated.  When this is done there are inevitably myriad
incompatibility and other problems that take time to work through, as we
saw in the 7.3->7.4 transition; our expectation is that 7.4->8.0 will be
at least as involved and likely more.  Unfortunately, the Ubuntu server
team is short-staffed this cycle, so plan to focus on the full php8
transition as part of the 21.10 cycle.

However, there is an important chunk of the transition we're doing this
cycle, which is updating phpunit from 8.5 -> 9.5.  This is a pre-
requisite piece for moving everything to php8, so having this in place
for hirsute will help make the php8 transition smoother.

In the meantime, if you have spare time to assist in the move to php8
your time can be well spent testing Debian's php8 stack and submitting
fixes and bug reports to them.  I plan to do similarly as time permits.

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Title:
  Please remove php8.0 from Ubuntu 21.04

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