add phpstan

Author: cesargb

.github/workflows/phpstan.yml

@@ -0,0 +1,38 @@
+name: phpstan
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  phpstan:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: 8.1
+
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v3
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php81-${{ hashFiles('**/composer.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-php81-
+
+    - name: Install dependencies
+      if: steps.composer-cache.outputs.cache-hit != 'true'
+      run: |
+        composer install
+        composer dump
+
+    - name: Run analyse phpstan
+      run: vendor/bin/phpstan analyse --error-format github

composer.json

@@ -32,6 +32,7 @@
         "test": "vendor/bin/phpunit"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0"
+        "phpunit/phpunit": "^9.0",
+        "phpstan/phpstan": "^1.9"
     }
 }

phpstan.neon.dist

@@ -0,0 +1,8 @@
+parameters:
+
+    paths:
+        - src
+        - tests
+
+    # The level 9 is the highest level
+    level: 5