EmptyInterface

src/Extension/CoreExtension.php

@@ -1419,6 +1419,10 @@ public static function toArray($seq, $preserveKeys = true)
      */
     public static function testEmpty($value): bool
     {
+        if ($value instanceof EmptyInterface) {
+            return $value->getIsEmpty();
+        }
+
         if ($value instanceof \Countable) {
             return 0 === \count($value);
         }

src/Extension/EmptyInterface.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Extension;
+
+/**
+ * Allows objects to declare whether they should be considered empty.
+ *
+ * @author Brandon Kelly <brandon@pixelandtonic.com>
+ * @since 3.24.1
+ */
+interface EmptyInterface
+{
+    /**
+     * @return bool
+     */
+    public function getIsEmpty(): bool;
+}