ci: add github actions for testing

.github/workflows/code_checks.yaml

@@ -0,0 +1,42 @@
+# .github/workflows/code_checks.yaml
+name: Code_Checks
+
+on: ["push", "pull_request"]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+
+    name: PHP ${{ matrix.php }}
+    steps:
+      # basically git clone
+      - uses: actions/checkout@v5
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+
+      # use PHP of specific version
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: curl
+
+      - name: Install dependencies
+        run: |
+          composer update --no-interaction --prefer-dist
+
+      - name: Execute main tests
+        run: php utils/test.php
+
+      - name: Execute object-oriented wrapper tests
+        run: php utils/ootest.php
+
+      - name: Execute additional tests
+        run: php utils/other-tests.php