test php8 compatibility

Author: Insolita

.github/workflows/test.yml

@@ -16,13 +16,11 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php-versions: [ '7.1', '7.2', '7.3', '7.4']
+        php-versions: ['7.4','7.3', '7.2', '7.1']
         phpunit-versions: ['latest']
         include:
              - php-versions: '8.0'
                phpunit-versions: '9.5.7'
-             - php-versions: '8.1'
-               phpunit-versions: '9.5.7'
 
     steps:
     - uses: actions/checkout@v2
@@ -34,7 +32,7 @@ jobs:
         extensions: mbstring, intl, gd, imagick, zip, dom, pgsql
         tools: php-cs-fixer, phpunit:${{ matrix.phpunit-versions }}
       env:
-          update: ${{ matrix.php-version == '8.0' || matrix.php-version == '8.1' }}
+          update: ${{ matrix.php-version == '8.0' }}
     - name: Get composer cache directory
       id: composercache
       run: echo "::set-output name=dir::$(composer config cache-files-dir)"
@@ -44,17 +42,12 @@ jobs:
       uses: actions/cache@v2
       with:
           path: ${{ steps.composercache.outputs.dir }}
-          key: ${{ runner.os }}-php-${{ matrix.php-versions }}-${{ matrix.phpunit-versions }}-${{ hashFiles('**/composer.json') }}
+          key: ${{ runner.os }}-php-${{ matrix.php-versions }}--${{ hashFiles('**/composer.json') }}
           restore-keys: |
-            ${{ runner.os }}-php-${{ matrix.php-versions }}-${{ matrix.phpunit-versions }}
+            ${{ runner.os }}-php-${{ matrix.php-versions }}-
 
     - name: Install deps
-      run: composer install --prefer-dist --no-progress --no-suggest --optimize-autoloader
-
-    - name: Unit tests 8.x with phpunit:${{ matrix.phpunit-versions }}
-      run: phpunit
-      if: matrix.php-versions == '8.0' || matrix.php-versions == '8.1'
+      run: composer install --prefer-dist --no-progress --optimize-autoloader
 
-    - name: Unit tests 7.x
+    - name: Unit tests
       run: php vendor/bin/phpunit
-      if: matrix.php-versions != '8.0' && matrix.php-versions != '8.1'

composer.json

@@ -7,14 +7,12 @@
         "validator"
     ],
     "require": {
-        "php":            ">=7.1.0",
+        "php":            "^7.1|^8.0",
         "yiisoft/yii2":   "~2.0.15"
-
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0|^8.0|^9.0",
-        "cebe/indent": "*",
-        "friendsofphp/php-cs-fixer": "~2.16|^3.0"
+        "cebe/indent": "*"
     },
     "autoload": {
         "psr-4": {