[Config] Fix XML dump when node example is an array

Author: alexandre-daubois

src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php

@@ -147,7 +147,7 @@ private function writeNode(NodeInterface $node, int $depth = 0, bool $root = fal
                 }
 
                 if ($child instanceof BaseNode && $example = $child->getExample()) {
-                    $comments[] = 'Example: '.$example;
+                    $comments[] = 'Example: '.(\is_array($example) ? implode(', ', $example) : $example);
                 }
 
                 if ($child->isRequired()) {

src/Symfony/Component/Config/Tests/Definition/Dumper/XmlReferenceDumperTest.php

@@ -42,6 +42,7 @@ private function getConfigurationAsString()
 <!-- scalar-deprecated-with-message: Deprecated (Since vendor/package 1.1: Deprecation custom message for "scalar_deprecated_with_message" at "acme_root") -->
 <!-- enum-with-default: One of "this"; "that" -->
 <!-- enum: One of "this"; "that" -->
+<!-- variable: Example: foo, bar -->
 <config
     boolean="true"
     scalar-empty=""
@@ -57,6 +58,7 @@ private function getConfigurationAsString()
     node-with-a-looong-name=""
     enum-with-default="this"
     enum=""
+    variable=""
     custom-node="true"
 >
 

src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php

@@ -114,6 +114,11 @@ enum:                 ~ # One of "this"; "that"
         # which should be indented
         child3:               ~ # Example: 'example setting'
     scalar_prototyped:    []
+    variable:
+
+        # Examples:
+        - foo
+        - bar
     parameters:
 
         # Prototype: Parameter name

src/Symfony/Component/Config/Tests/Fixtures/Configuration/ExampleConfiguration.php

@@ -58,6 +58,9 @@ public function getConfigTreeBuilder(): TreeBuilder
                 ->arrayNode('scalar_prototyped')
                     ->prototype('scalar')->end()
                 ->end()
+                ->variableNode('variable')
+                    ->example(['foo', 'bar'])
+                ->end()
                 ->arrayNode('parameters')
                     ->useAttributeAsKey('name')
                     ->prototype('scalar')->info('Parameter name')->end()