check php syntax on all supported versions

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

@@ -0,0 +1,21 @@
+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', 'highest']
+		steps:
+			- name: Setup PHP
+				uses: shivammathur/setup-php@v2
+				with:
+					php-version: ${{ matrix.php-versions }}
+					tools: composer
+
+			- name: checkout repo
+				uses: actions/checkout@v3
+
+			- run: composer run check-syntax

composer.json

@@ -30,5 +30,8 @@
 		"allow-plugins": {
 			"dealerdirect/phpcodesniffer-composer-installer": true
 		}
-	}
+	},
+	"scripts": {
+  	"check-syntax": "find . -name '*.php' -not -path './vendor/*' -not -path './node_modules/*' -print0 | xargs -0 -n1 php -l"
+  }
 }