Check PHP syntax

.github/workflows/tests.yml

@@ -36,9 +36,42 @@ jobs:
         name: Check PHP coding style
         run: php-cs-fixer fix --config=./.php-cs-fixer.dist.php --dry-run --using-cache=no --diff --show-progress=dots --verbose --no-interaction --ansi
 
+  php-syntax:
+    name: Check PHP syntax
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-version:
+          - "5.3"
+          - "8.4"
+    steps:
+      -
+        name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          extensions: opcache
+          tools: none
+          coverage: none
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Check PHP syntax
+        uses: mlocati/check-php-syntax@v1
+        with:
+          include: |
+            bin/export-plural-rules
+            bin/import-cldr-data
+          exclude: |
+            .php-cs-fixer.dist.php
+          fail-on-warnings: true
+
   phpunit:
     name: Run PHPUnit tests
-    needs: php-coding-style
+    needs: 
+      - php-coding-style
+      - php-syntax
     strategy:
       matrix:
         os: