bug #41072 [VarExporter] Add support of PHP enumerations (alexandre-daubois)

This PR was merged into the 4.4 branch.

Discussion
----------

[VarExporter] Add support of PHP enumerations

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #40237
| License       | MIT
| Doc PR        | _none_

Commits
-------

4b0f2997a5 [VarExporter] Add support of PHP enumerations

src/Symfony/Component/VarExporter/Internal/Exporter.php

@@ -62,7 +62,7 @@ class Exporter
                     $value = self::prepare($value, $objectsPool, $refsPool, $objectsCount, $valueIsStatic);
                 }
                 goto handle_value;
-            } elseif (!\is_object($value) && !$value instanceof \__PHP_Incomplete_Class) {
+            } elseif (!\is_object($value) && !$value instanceof \__PHP_Incomplete_Class || $value instanceof \UnitEnum) {
                 goto handle_value;
             }
 
@@ -190,7 +190,7 @@ class Exporter
     public static function export($value, $indent = '')
     {
         switch (true) {
-            case \is_int($value) || \is_float($value): return var_export($value, true);
+            case \is_int($value) || \is_float($value) || $value instanceof \UnitEnum: return var_export($value, true);
             case [] === $value: return '[]';
             case false === $value: return 'false';
             case true === $value: return 'true';

src/Symfony/Component/VarExporter/Tests/Fixtures/FooUnitEnum.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Symfony\Component\VarExporter\Tests\Fixtures;
+
+enum FooUnitEnum
+{
+    case Bar;
+}

src/Symfony/Component/VarExporter/Tests/Fixtures/unit-enum.php

@@ -0,0 +1,5 @@
+<?php
+
+return [
+    Symfony\Component\VarExporter\Tests\Fixtures\FooUnitEnum::Bar,
+];

src/Symfony/Component/VarExporter/Tests/VarExporterTest.php

@@ -16,6 +16,7 @@ use Symfony\Component\VarDumper\Test\VarDumperTestTrait;
 use Symfony\Component\VarExporter\Exception\ClassNotFoundException;
 use Symfony\Component\VarExporter\Exception\NotInstantiableTypeException;
 use Symfony\Component\VarExporter\Internal\Registry;
+use Symfony\Component\VarExporter\Tests\Fixtures\FooUnitEnum;
 use Symfony\Component\VarExporter\VarExporter;
 
 class VarExporterTest extends TestCase
@@ -209,6 +210,10 @@ class VarExporterTest extends TestCase
         yield ['private-constructor', PrivateConstructor::create('bar')];
 
         yield ['php74-serializable', new Php74Serializable()];
+
+        if (\PHP_VERSION_ID >= 80100) {
+            yield ['unit-enum', [FooUnitEnum::Bar], true];
+        }
     }
 }
 

src/Symfony/Component/VarExporter/VarExporter.php

@@ -43,7 +43,7 @@ final class VarExporter
     {
         $isStaticValue = true;
 
-        if (!\is_object($value) && !(\is_array($value) && $value) && !$value instanceof \__PHP_Incomplete_Class && !\is_resource($value)) {
+        if (!\is_object($value) && !(\is_array($value) && $value) && !$value instanceof \__PHP_Incomplete_Class && !\is_resource($value) || $value instanceof \UnitEnum) {
             return Exporter::export($value);
         }