Added PHP8 test on Github

Author: Geolim4

.github/workflows/tests.yml

@@ -37,4 +37,18 @@ jobs:
           extensions: mbstring, intl, pdo_sqlite, json
           ini-values: apc.enabled=1, apc.shm_size=32M, apc.ttl=7200, apc.enable_cli=1, apc.serializer=php
       - name: Run tests on PHP 7.4
-        run: php -f ./bin/ci/run_tests.php
+        run: php -f ./bin/ci/run_tests.php
+
+      # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
+      # Docs: https://getcomposer.org/doc/articles/scripts.md
+      - name: Run tests on PHP 8.0
+        run: php -f ./bin/ci/run_tests.php
+      - name: Setup PHP 8.0
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.0'
+          coverage: none
+          extensions: mbstring, intl, pdo_sqlite, json
+          ini-values: apc.enabled=1, apc.shm_size=32M, apc.ttl=7200, apc.enable_cli=1, apc.serializer=php
+      - name: Run tests on PHP 8.0
+        run: php -f ./bin/ci/run_tests.php