add cs checking to ci flow

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Validate composer.json and composer.lock
       run: composer validate
@@ -26,9 +26,17 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-php-
 
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: '7.3'
+
     - name: Install dependencies
       if: steps.composer-cache.outputs.cache-hit != 'true'
       run: composer install --prefer-dist --no-progress --no-suggest
 
+    - name: Run script
+      run: composer run-script cs-check
+
     - name: Run PHPUnit
       run: composer run-script test

.gitignore

@@ -4,4 +4,7 @@
 .phan
 composer.lock
 
+/.phpcs-cache
+/phpcs.xml
+
 .phpunit.result.cache

composer.json

@@ -12,9 +12,11 @@
     "phan/phan": "^2.7"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9"
+    "phpunit/phpunit": "^9",
+    "squizlabs/php_codesniffer": "^3.7"
   },
   "scripts": {
-    "test": "vendor/bin/phpunit tests"
+    "test": "vendor/bin/phpunit tests",
+    "cs-check" : "vendor/bin/phpcs"
   }
 }

phpcs.xml.dist

@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<ruleset name="The Algorithms - PHP">
+    <description>PHP CodeSniffer configuration for The Algorithms - PHP.</description>
+
+    <!-- Set the default standard to PSR-12 -->
+    <arg name="standard" value="PSR12"/>
+
+    <file>.</file>
+
+    <!-- Include only .php files -->
+    <arg name="extensions" value="php"/>
+</ruleset>