Attach behavior via "as behaviorName" with Closure

framework/CHANGELOG.md

@@ -8,6 +8,7 @@ Yii Framework 2 Change Log
 - Bug #20231: Fix regression introduced in #20167 in `yii\validators\FileValidator` (bizley)
 - Enh #20247: Support for variadic console controller action methods (brandonkelly)
 - Bug #20256: Add support for dropping views in MSSQL server when running migrate/fresh (ambrozt)
+- Enh #20248: Add support for attaching behaviors in configurations with Closure (timkelty)
 
 2.0.51 July 18, 2024
 --------------------

framework/base/Component.php

@@ -190,6 +190,8 @@ public function __set($name, $value)
             $name = trim(substr($name, 3));
             if ($value instanceof Behavior) {
                 $this->attachBehavior($name, $value);
+            } elseif ($value instanceof \Closure) {
+                $this->attachBehavior($name, call_user_func($value));
             } elseif (isset($value['__class']) && is_subclass_of($value['__class'], Behavior::class)) {
                 $this->attachBehavior($name, Yii::createObject($value));
             } elseif (!isset($value['__class']) && isset($value['class']) && is_subclass_of($value['class'], Behavior::class)) {

tests/framework/base/ComponentTest.php

@@ -366,6 +366,12 @@ public function testAttachBehavior()
         } catch (InvalidConfigException $e) {
             $this->assertSame('Class is not of type yii\base\Behavior or its subclasses', $e->getMessage());
         }
+
+        $component = new NewComponent();
+        $component->{'as f'} = function () {
+            return new NewBehavior();
+        };
+        $this->assertNotNull($component->getBehavior('f'));
     }
 
     public function testAttachBehaviors()