check php syntax on all supported PHP versions

.github/workflows/check-php-syntax.yml

@@ -0,0 +1,23 @@
+name: Check PHP syntax
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+    steps:
+      # Install PHP interpreter
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+
+      # Checkout source repository
+      - name: checkout repo
+        uses: actions/checkout@v3
+
+      # Lint every PHP source file using PHP interpreter
+      - run: composer run check-syntax

composer.json

@@ -26,6 +26,7 @@
   },
   "scripts": {
     "test": "php vendor/bin/phpunit --bootstrap tests/bootstrap.php  tests/",
+    "check-syntax": "find . -name '*.php' -not -path './vendor/*' -not -path './var/cache/*' -print0 | xargs -0 -n1 php -l",
     "lint": "vendor/bin/phpcs -n -s",
     "fmt": "vendor/bin/phpcbf"
   }