Restructured doc, improved test

README.md

@@ -61,16 +61,7 @@ For more details and other installation methods, see
 You can use pre-built Docker images to run ``php-cs-fixer``.
 
 ```console
-docker run -v $(pwd):/code ghcr.io/php-cs-fixer/php-cs-fixer:$FIXER_VERSION fix src
-```
-
-Or integrate as check into Gitlab CI like this:
-
-```yaml
-php-cs-fixer:
-  image: ghcr.io/php-cs-fixer/php-cs-fixer:$FIXER_VERSION
-  script:
-    php-cs-fixer fix --diff --dry-run --format=txt src
+docker run -v $(pwd):/code ghcr.io/php-cs-fixer/php-cs-fixer:${FIXER_VERSION:-3-php8.3} fix src
 ```
 
 `$FIXER_VERSION` used in example above is an identifier of a release you want to use, which is based on Fixer and PHP versions combined. There are different tags for each Fixer's SemVer level and PHP version with syntax `<php-cs-fixer-version>-php<php-version>`. For example:

doc/installation.rst

@@ -77,6 +77,18 @@ Install `PHIVE <https://phar.io>`_ and issue the following command:
 
     phive install php-cs-fixer # use `--global` for global install
 
+Gitlab-CI (Docker)
+~~~~~~~~~~~~~~~~~~
+
+To integrate php-cs-fixer as check into Gitlab-CI, you can use a configuration like this:
+
+.. code-block:: yaml
+
+    php-cs-fixer:
+      image: ghcr.io/php-cs-fixer/php-cs-fixer:$FIXER_VERSION
+      script:
+        php-cs-fixer fix --diff --dry-run --format=txt src
+
 Update
 ------
 

tests/AutoReview/CiConfigurationTest.php

@@ -266,12 +266,9 @@ private function getPhpVersionsUsedByGitHubDocker(): array
     {
         $yaml = Yaml::parse(file_get_contents(__DIR__.'/../../.github/workflows/docker.yml'));
 
-        $phpVersions = [];
-
-        foreach ($yaml['jobs']['build-and-push-image']['strategy']['matrix']['include'] as $job) {
-            $phpVersions[] = $job['php-version'];
-        }
-
-        return $phpVersions;
+        return array_map(
+            static fn($item) => $item['php-version'],
+            $yaml['jobs']['build-and-push-image']['strategy']['matrix']['include']
+        );
     }
 }