Introduce PHPStan

.github/workflows/ci.yml

@@ -89,6 +89,37 @@ jobs:
       - name: Code style with PHP-CS-Fixer
         run: ./vendor/bin/php-cs-fixer fix --dry-run --diff
 
+  phpstan:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          extensions: ctype, dom, gd, iconv, fileinfo, libxml, mbstring, simplexml, xml, xmlreader, xmlwriter, zip, zlib
+          coverage: none
+          tools: cs2pr
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-progress --prefer-dist --optimize-autoloader
+
+      - name: Static analysis with PHPStan
+        run: ./vendor/bin/phpstan analyse
+
   coverage:
     runs-on: ubuntu-latest
     steps:

composer.json

@@ -45,7 +45,8 @@
             "php-cs-fixer fix --ansi --dry-run --diff",
             "phpcs --report-width=200 --report-summary --report-full samples/ src/ tests/ --ignore=src/PhpWord/Shared/PCLZip --standard=PSR2 -n",
             "phpmd src/,tests/ text ./phpmd.xml.dist --exclude pclzip.lib.php",
-            "@test-no-coverage"
+            "@test-no-coverage",
+            "phpstan analyse --ansi"
         ],
         "fix": [
             "php-cs-fixer fix --ansi"
@@ -79,7 +80,8 @@
         "phpunit/phpunit": ">=7.0",
         "tecnickcom/tcpdf": "^6.5",
         "symfony/process": "^4.4",
-        "friendsofphp/php-cs-fixer": "^3.3"
+        "friendsofphp/php-cs-fixer": "^3.3",
+        "phpstan/phpstan-phpunit": "@stable"
     },
     "suggest": {
         "ext-zip": "Allows writing OOXML and ODF",