Added phpmd support for code quality checks

.github/workflows/php.yml

@@ -1,4 +1,4 @@
-name: PHP lint & test
+name: PHP lint, scan & test
 
 on: [push, pull_request]
 
@@ -27,6 +27,12 @@ jobs:
       - name: Run PHPCS Lint
         run: composer lint
 
+      - name: Run PHPStan
+        run: composer phpstan
+
+      - name: Run PHPMD
+        run: composer phpmd
+
       - name: Run PHPUnit tests
         run: composer test
 

composer.json

@@ -17,7 +17,8 @@
         "phpstan/phpstan-strict-rules": "^1.6",
         "phpunit/phpunit": "^11.1",
         "slevomat/coding-standard": "^8.15",
-        "squizlabs/php_codesniffer": "^3.10"
+        "squizlabs/php_codesniffer": "^3.10",
+        "phpmd/phpmd": "^2.15"
     },
     "autoload": {
         "psr-4": {
@@ -45,6 +46,7 @@
         "lint": "phpcs",
         "lint:fix": "phpcbf",
         "php:badge": "bin/coverage-badge coverage/clover.xml badges/php.svg PHP",
+        "phpmd": "phpmd coverage-badge.php,src text phpmd.xml --color",
         "phpstan": "phpstan analyse --memory-limit=2048M",
         "test": "phpunit --testdox --coverage-clover coverage/clover.xml --coverage-html coverage --coverage-filter src/"
     }