[PropertyAccess] Fix compatibility with PHP 8.4 asymmetric visibility

Author: Florian-Merle

PropertyAccessor.php

@@ -640,15 +640,22 @@ private function getWriteInfo(string $class, string $property, mixed $value): Pr
      */
     private function isPropertyWritable(object $object, string $property): bool
     {
+        if ($object instanceof \stdClass && property_exists($object, $property)) {
+            return true;
+        }
+
         $mutatorForArray = $this->getWriteInfo($object::class, $property, []);
+        if (PropertyWriteInfo::TYPE_PROPERTY === $mutatorForArray->getType()) {
+            return $mutatorForArray->getVisibility() === 'public';
+        }
 
-        if (PropertyWriteInfo::TYPE_NONE !== $mutatorForArray->getType() || ($object instanceof \stdClass && property_exists($object, $property))) {
+        if (PropertyWriteInfo::TYPE_NONE !== $mutatorForArray->getType()) {
             return true;
         }
 
         $mutator = $this->getWriteInfo($object::class, $property, '');
 
-        return PropertyWriteInfo::TYPE_NONE !== $mutator->getType() || ($object instanceof \stdClass && property_exists($object, $property));
+        return PropertyWriteInfo::TYPE_NONE !== $mutator->getType();
     }
 
     /**

Tests/Fixtures/AsymmetricVisibility.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\PropertyAccess\Tests\Fixtures;
+
+class AsymmetricVisibility
+{
+    public public(set) mixed $publicPublic = null;
+    public protected(set) mixed $publicProtected = null;
+    public private(set) mixed $publicPrivate = null;
+    private private(set) mixed $privatePrivate = null;
+    public bool $virtualNoSetHook { get => true; }
+}

Tests/PropertyAccessorTest.php

@@ -20,6 +20,7 @@
 use Symfony\Component\PropertyAccess\PropertyAccess;
 use Symfony\Component\PropertyAccess\PropertyAccessor;
 use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
+use Symfony\Component\PropertyAccess\Tests\Fixtures\AsymmetricVisibility;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\ExtendedUninitializedProperty;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\ReturnTyped;
 use Symfony\Component\PropertyAccess\Tests\Fixtures\TestAdderRemoverInvalidArgumentLength;
@@ -1023,4 +1024,62 @@ private function createUninitializedObjectPropertyGhost(): UninitializedObjectPr
         return $class::createLazyGhost(initializer: function ($instance) {
         });
     }
+
+    /**
+     * @requires PHP 8.4
+     */
+    public function testIsWritableWithAsymmetricVisibility()
+    {
+        $object = new AsymmetricVisibility();
+
+        $this->assertTrue($this->propertyAccessor->isWritable($object, 'publicPublic'));
+        $this->assertFalse($this->propertyAccessor->isWritable($object, 'publicProtected'));
+        $this->assertFalse($this->propertyAccessor->isWritable($object, 'publicPrivate'));
+        $this->assertFalse($this->propertyAccessor->isWritable($object, 'privatePrivate'));
+        $this->assertFalse($this->propertyAccessor->isWritable($object, 'virtualNoSetHook'));
+    }
+
+    /**
+     * @requires PHP 8.4
+     */
+    public function testIsReadableWithAsymmetricVisibility()
+    {
+        $object = new AsymmetricVisibility();
+
+        $this->assertTrue($this->propertyAccessor->isReadable($object, 'publicPublic'));
+        $this->assertTrue($this->propertyAccessor->isReadable($object, 'publicProtected'));
+        $this->assertTrue($this->propertyAccessor->isReadable($object, 'publicPrivate'));
+        $this->assertFalse($this->propertyAccessor->isReadable($object, 'privatePrivate'));
+        $this->assertTrue($this->propertyAccessor->isReadable($object, 'virtualNoSetHook'));
+    }
+
+    /**
+     * @requires PHP 8.4
+     *
+     * @dataProvider setValueWithAsymmetricVisibilityDataProvider
+     */
+    public function testSetValueWithAsymmetricVisibility(string $propertyPath, ?string $expectedException)
+    {
+        $object = new AsymmetricVisibility();
+
+        if ($expectedException) {
+            $this->expectException($expectedException);
+        } else {
+            $this->expectNotToPerformAssertions();
+        }
+
+        $this->propertyAccessor->setValue($object, $propertyPath, true);
+    }
+
+    /**
+     * @return iterable<array{0: string, 1: null|class-string}>
+     */
+    public static function setValueWithAsymmetricVisibilityDataProvider(): iterable
+    {
+        yield ['publicPublic', null];
+        yield ['publicProtected', \Error::class];
+        yield ['publicPrivate', \Error::class];
+        yield ['privatePrivate', NoSuchPropertyException::class];
+        yield ['virtualNoSetHook', \Error::class];
+    }
 }