如何降级 PHP 版本（您的 PHP 版本不满足该要求）？

Question

After running sudo apt-get update && sudo apt-get dist-upgrade on my Laravel app, I'm getting this error on the next deployment:

- This package requires php ^7.1.3 but your PHP version (8.1.6) does not satisfy that requirement.

In my composer.json, ^7.1.3 is the specified version. This is my first time running the apt-get update and I don't know why the php version got updated as well.

On each deployment I run

composer install --no-interaction --prefer-dist --optimize-autoloader

How can I downgrade the version to ? This happens on an existing app in production and I have to be very careful about it.

Answer 1

The php version installed on your environment should be compatible with your project.

If your project is based on composer package manager (as I see), it can help you to control which php version you need on the server.

In your case I would recommend to restore from the snapshot or just install php 7.1.3 version back.

If you want to use php 7.4/8/8.1 in your project, before you should upgrade your code and project dependencies and ensure, that everything working fine with the desired version of php.

Answer 2

Old topic, but for things like this, I recommend adding the flag to ignore requirements like this. So try:

composer install --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-reqs

There may be incompatibilities with your project using 8.1 instead of 7.1.3, but I doubt it. But still, only do this if you feel confident the PHP version won't be an issue. It's usually better than downgrading, however.