Pas de référence à @PHP73Migration sur les versions minimales.

src/Composer/ComposerPackage.php

@@ -90,7 +90,7 @@ final class ComposerPackage implements ComposerPackageInterface
 
         $data = $this->getComposerJson();
 
-        return \array_key_exists($key, $data) ? $data[$key] : $default;
+        return array_key_exists($key, $data) ? $data[$key] : $default;
     }
 
     private function getComposerJson(): array

src/Config.php

@@ -73,20 +73,31 @@ final class Config extends PhpCsFixerConfig
         );
     }
 
+    /**
+     * @param float $phpVersion
+     * @param bool  $risky
+     *
+     * @return array
+     */
     private function ruleSets(float $phpVersion, bool $risky): array
     {
-        return [
+        $sets = [
             '@PSR2'                 => true,
             '@Symfony'              => true,
             '@Symfony:risky'        => $risky,
-            '@PHP56Migration'       => $phpVersion >= 5.6,
-            '@PHP56Migration:risky' => $risky && $phpVersion >= 5.6,
-            '@PHP70Migration'       => $phpVersion >= 7.0,
-            '@PHP70Migration:risky' => $risky && $phpVersion >= 7.0,
-            '@PHP71Migration'       => $phpVersion >= 7.1,
-            '@PHP71Migration:risky' => $risky && $phpVersion >= 7.1,
-            '@PHP73Migration'       => $phpVersion >= 7.3,
+            '@PHP56Migration'       => true,
+            '@PHP56Migration:risky' => $risky,
+            '@PHP70Migration'       => true,
+            '@PHP70Migration:risky' => $risky,
+            '@PHP71Migration'       => true,
+            '@PHP71Migration:risky' => $risky,
         ];
+
+        if ($phpVersion >= 7.3) {
+            $sets['@PHP73Migration'] = true;
+        }
+
+        return $sets;
     }
 
     public function baseRules(float $phpVersion, bool $risky): array
@@ -169,10 +180,12 @@ final class Config extends PhpCsFixerConfig
         $gitRepository = new CachedGitRepository($backendGitRepository, $cache);
 
         $headerProvider = new FormattedHeaderProvider(
-            new ChainTemplateProvider([
-                new UserDefinedTemplateProvider($fileLocator),
-                new LicenseTemplateProvider($composerPackage),
-            ]),
+            new ChainTemplateProvider(
+                [
+                    new UserDefinedTemplateProvider($fileLocator),
+                    new LicenseTemplateProvider($composerPackage),
+                ]
+            ),
             new TemplateFormatter($gitRepository, $composerPackage)
         );