Fix the PHP8+ warnings #126

	name: PHPUnit

	on: pull_request

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	php-versions:
	- 8.0

	env:
	DB_DATABASE: test_db
	DB_USER: root
	DB_PASSWORD: root

	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Install wordpress environment
	run: npm -g install @wordpress/env

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	tools: composer
	php-version: ${{ matrix.php-versions }}

	- name: Setup MySQL
	run: \|
	sudo /etc/init.d/mysql start

	- name: Cache Composer packages
	id: composer-cache
	uses: actions/cache@v2
	with:
	path: vendor
	key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
	restore-keys: \|
	${{ runner.os }}-php-

	- name: Install dependencies
	run: composer install --prefer-dist --no-progress

	- name: Setup the wordpress environment
	run: wp-env start

	- name: PHPUnit
	run: composer test

	- name: PHPUnit multisite
	run: composer run-script test-multisite

Provide feedback