Revert all PHP versions lower than 8.0 to Xdebug 2.9

[ste93cry]

This PR reverts the update of Xdebug to version 3 that I did in #650 on all PHP versions lower than 8.0. While Travis CI luckily did not rebuilt their existing images, it published the new ones that did get the upgrade in ac92f4e and this caused all projects that were running fine with Xdebug 2 and PHPUnit 7 to broke unexpectly

[GrahamCampbell]

You can use PHPUnit 8 on PHP 7.2.

[GrahamCampbell]

If travis or you want to PR customisation of xdebug version, I'd review that.

[ste93cry]

You can use PHPUnit 8 on PHP 7.2

I understand, but isn't this a breaking change? I mean, up to a certain patch version of PHP you get Xdebug 2.9 while after that same version you get Xdebug 3.0. I understand that it's not your fault, but we cannot expect people to update all their projects to run PHPUnit 8 just because betwen patch releases Xdebug becames incompatible, can we?

[GrahamCampbell]

Yes, it is a breaking change, and we have always upgraded images to the very latest version of xdebug they can run. This is really an issue with Travis, and not us. It is up to them if they want to upgrade to the latest version of this package, and get any breaking changes made since the last version they were using.

[ste93cry]

we have always upgraded images to the very latest version of xdebug they can run

Looking at the commit history I didn't find a case where Xdebug got upgraded to a new major versions for all images already released and for a new minor release of PHP. I understand it's not your business what Travis does, but knowing that a lot of people use it and consequently they depend from this package, I have a different opinion on this matter. Anyway, if it's fine for you then ok

[GrahamCampbell]

Looking at the commit history I didn't find a case where Xdebug got upgraded to a new major versions for all images already released and for a new minor release of PHP.

That is just a co-incidence. All images always use the very latest version that is supported.

I understand it's not your business what Travis does, but knowing that a lot of people use it and consequently they depend from this package, I have a different opinion on this matter.

It is totally up to Travis what version of this package they use, and up to them to decide if they want to upgrade or not. This package is provided on an "as is" basis, without warrantee. Since Travis do not fund this package, they have no say over the direction of the package, although I will not be unreasonable (I would accept PRs to allow customisation of the xdebug version, but I am not going to implement this myself for free).

[GrahamCampbell]

In fact, I am actually very close to abandoning this project entirely, given there is no funding, and no active core team to help out with day-to-day. I don't even use it myself anymore.

[ste93cry]

Since Travis do not fund this package, they have no say over the direction

Just to clarify, I do not work for Travis and I spoke just for myself. If they thought the recent changes were a problem I'm pretty sure they would have already did something. A project I contribute to has just been impacted by my changes here and I tried the easy way to fix the issue by rolling back the breaking change here. I didn't meant to be rude or whatever else. I honestly didn't even know this project was the basis of the PHP images on Travis, I started looking how it was working behind the scene just because I was looking for the PHP8 support. Anyway, for what's worth, thank you for the hard work you put into this repository all this time 💪

[jarstelfox]

@GrahamCampbell, Thank you for all the work you have put into this project.

In fact, I am actually very close to abandoning this project entirely, given there is no funding, and no active core team to help out with day-to-day.

I would recommend putting out a call to the community looking for people to take over the maintainer role. Who knows, maybe the project lives on and is something off your plate.

Thank you again.

[GrahamCampbell]

Every time I do this, a couple of people show interest, then drop off after a few weeks or months. ;(