Enforce PHP 8.0 (and up) compatibility through PHPCS

Author: coenjacobs

composer.json

@@ -21,7 +21,8 @@
     },
     "config": {
         "allow-plugins": {
-            "phpstan/extension-installer": true
+            "phpstan/extension-installer": true,
+            "dealerdirect/phpcodesniffer-composer-installer": true
         },
         "platform": {
             "php": "8.0"
@@ -36,7 +37,9 @@
         "phpstan/extension-installer": "^1.4",
         "league/flysystem": "^2.5",
         "symfony/console": "^5.4",
-        "symfony/finder": "^5.4"
+        "symfony/finder": "^5.4",
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "phpcompatibility/php-compatibility": "dev-develop"
     },
     "scripts": {
         "test": [

phpcs.xml.dist

@@ -3,5 +3,9 @@
 <ruleset name="mozart">
     <description>Coding standard ruleset based on the PSR-2 coding standard.</description>
     <rule ref="PSR2"/>
+
+    <rule ref="PHPCompatibility"/>
+    <config name="testVersion" value="8.0-"/>
+
     <file>./src</file>
-</ruleset>
+</ruleset>