Rely on reflection to access null properties

src/Extension/CoreExtension.php

@@ -102,6 +102,9 @@ final class CoreExtension extends AbstractExtension
     private $numberFormat = [0, '.', ','];
     private $timezone = null;
 
+    private static $classReflectors = [];
+    private static $propertyReflectors = [];
+
     /**
      * Sets the default format to be used by the date filter.
      *
@@ -1626,9 +1629,12 @@ public static function getAttribute(Environment $env, Source $source, $object, $
         if (Template::METHOD_CALL !== $type) {
             $arrayItem = \is_bool($item) || \is_float($item) ? (int) $item : $item;
 
-            if (((\is_array($object) || $object instanceof \ArrayObject) && (isset($object[$arrayItem]) || \array_key_exists($arrayItem, (array) $object)))
-                || ($object instanceof \ArrayAccess && isset($object[$arrayItem]))
-            ) {
+            if (match (true) {
+                \is_array($object) => \array_key_exists($arrayItem, $object),
+                $object instanceof \ArrayObject => \array_key_exists($arrayItem, $object->getArrayCopy()),
+                $object instanceof \ArrayAccess => isset($object[$arrayItem]),
+                default => false
+            }) {
                 if ($isDefinedTest) {
                     return true;
                 }
@@ -1697,7 +1703,12 @@ public static function getAttribute(Environment $env, Source $source, $object, $
 
         // object property
         if (Template::METHOD_CALL !== $type) {
-            if (isset($object->$item) || \array_key_exists((string) $item, (array) $object)) {
+            $propertyReflector = false;
+            if (match (true) {
+                isset($object->$item) => true,
+                ($propertyReflector = self::$propertyReflectors[$object::class][$item] ??= self::getPropertyReflector($object, $item))->isInitialized($object) => true,
+                default => false,
+            }) {
                 if ($isDefinedTest) {
                     return true;
                 }
@@ -1706,7 +1717,7 @@ public static function getAttribute(Environment $env, Source $source, $object, $
                     $env->getExtension(SandboxExtension::class)->checkPropertyAllowed($object, $item, $lineno, $source);
                 }
 
-                return isset($object->$item) ? $object->$item : ((array) $object)[(string) $item];
+                return $propertyReflector ? $propertyReflector->getValue($object) : $object->$item;
             }
 
             if (\defined($object::class.'::'.$item)) {
@@ -2055,4 +2066,50 @@ public static function parseAttributeFunction(Parser $parser, Node $fakeNode, $a
 
         return new GetAttrExpression($args[0], $args[1], $args[2] ?? null, Template::ANY_CALL, $line);
     }
+
+    private static function getPropertyReflector(object $object, string $property): \ReflectionProperty
+    {
+        $class = self::$classReflectors[$object::class] ??= new \ReflectionClass($object::class);
+
+        if ($class->hasProperty($property)) {
+            $reflector = $class->getProperty($property);
+
+            if ($reflector->isPublic()) {
+                return $reflector;
+            }
+
+            return new class () extends \ReflectionProperty {
+                public function isInitialized(?object $object = null): bool
+                {
+                    return false;
+                }
+            };
+        }
+
+        return new class ($property) extends \ReflectionProperty {
+            private $value;
+
+            public function __construct(private string $property)
+            {
+            }
+
+            public function isInitialized(?object $object = null): bool
+            {
+                $arrayCast = (array) $object;
+
+                if (\array_key_exists($this->property, $arrayCast)) {
+                    $this->value = $arrayCast[$this->property];
+
+                    return true;
+                }
+
+                return false;
+            }
+
+            public function getValue(?object $object = null): mixed
+            {
+                return $this->value;
+            }
+        };
+    }
 }