Drop support for PHP 7.0/7.1/7.2

[blackcoder87]

PHP 7.0 and 7.1 are both no longer officially supported.
http://php.net/supported-versions.php

Linux distributions using PHP 7.0:
Debian 9 = PHP 7.0
Ubuntu 16.04 LTS = PHP 7.0
openSUSE Tumbleweed = PHP 7.0

For PHP 7.0 that would be according to Debian 9 LTS in June 2022.

Ubuntu 18.04 LTS is using PHP 7.2.
https://packages.ubuntu.com/bionic/php
https://ubuntu.com/about/release-cycle

Debian 10 is using PHP 7.3.
https://packages.debian.org/buster/php/

Fedora 27 is no longer supported
Fedora 28 and newer are using PHP 7.2 or newer.
https://en.wikipedia.org/wiki/Fedora_(operating_system)#Releases

OpenSUSE 15.1 is using PHP 7.2
https://en.wikipedia.org/wiki/OpenSUSE#Releases

Most if not all distributions skipped PHP 7.1? Consider dropping support for PHP 7.0 and 7.1 at the same time.

Debian Long Term Support
https://wiki.debian.org/LTS

The Ubuntu lifecycle and release cadence
https://www.ubuntu.com/about/release-cycle

[blackcoder87]

PHP 7.0
Ubuntu 16.04 "Maintenance updates" ended ~June 2020

PHP 7.2
Ubuntu 18.04 "Maintenance updates" until ~June 2022.
Fedora 28-32 is no longer supported. Fedora 33 and 34 is using PHP 7.4. Fedora 35 will probably use PHP 8.
Latest point release for OpenSUSE is 15.3 and is using PHP 7.4.

https://ubuntu.com/about/release-cycle
https://en.wikipedia.org/wiki/Fedora_(operating_system)#Releases

[blackcoder87]

Probably a good idea to announce the removal of support for older versions early like it was done with the removal of support for PHP 5.6. See links to the old news below.

If possible remove support for PHP 7.2 together with PHP 7.0 and 7.1 in June 2022 or earlier.
PHPUnit can then be updated to version 9 or hopefully 10 and Ilch is no longer depending on using forks of phpunit and phpunit-mock-objects to run unit tests under PHP 8 or newer.

https://www.ilch.de/index.php?news-344
https://www.ilch.de/index.php?news-355

[blackcoder87]

Ping and a small info:
Debian 10 with PHP 7.3 is supported until June 30th 2024.

https://wiki.debian.org/LTS

[blackcoder87]

#423