Looking for a PHP version of PHP 8.1 for a specific virtual website

Question

I have a dummy website written in Laravel9 on an ubuntu 18.04 server, it requires php version 8.0.2 or higher. The error looks like this in the browser:

Composer has detected a problem on your platform: Your Composer dependency requires PHP version '>= 8.0.2'.

In the system I have PHP 7.4.29 (cli) but can't change it since other virtual sites require 7.4.

How to get php 8.1 to Laravel9 site to make it work?

Answer 1

If using Debian/Ubuntu:

apt -y install software-properties-common
add-apt-repository ppa:ondrej/php
apt -y install php8.1

CentOS：

dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
dnf install dnf-utils http://rpms.remirepo.net/enterprise/remi-release-8.rpm

dnf remove php* -y
dnf module list reset php -y
dnf module enable php:remi-8.1
dnf install php

Answer 2

Okay, I found that what is needed is a composer command:

composer install --ignore-platform-reqs

So now there are no more errors. Now I have other things to worry about, but that's Laravel's thing.

My other sites still work fine despite now being on php 8.1.

thanks for your help.