Widget::end will crash if widget is configured by closure in di container

[jrajamaki]

What steps will reproduce the problem?

Using basic app as an example, create your own widget, e.g.

class ActiveForm extends yii\bootstrap5\ActiveForm {}

and configure di container to replace the original implementation using closure:

'container' => [
    'definitions' => [
        yii\bootstrap5\ActiveForm::class => fn ($container, $params, $config) => new ActiveForm($config),
    ]
],

Now when accessing basic app's "Contact" page, then app crashes with error "Cannot use object of type Closure as array".

What is the expected result?

It would work.

What do you get instead?

"Cannot use object of type Closure as array" error.

Additional info

Similar to yiisoft/yii2-debug#234.
Caused by commit 0dbc4d3.

Q	A
Yii version	2.0.51
PHP version	8.3.9
Operating system	macOS 14.5 Sonoma

[jrajamaki]

Would you agree to take PR for this?

If so, how it should work?

• skip check like how "Cannot use object of type Closure as array" error yii2-debug#234 was fixed?
• try to check callable's return type if available?
• something else, what?

[samdark]

Yes. Sure. PR is very welcome. Skipping the check sounds alright.

[rob006]

We could save class in begin() and use it in end() instead of getting definition from container.

[jrajamaki]

We could save class in begin() and use it in end() instead of getting definition from container.

That's how it works already. end() just has some safeguards so that developer wouldn't do anything stupid like trigger end() without begin() or mix two widgets:

WidgetA::begin([...]);
WidgetB::begin([...]);
WidgetA::end();
WidgetB::end();

The initial problem is that WidgetA might not be WidgetA because begin() uses Yii::createObject() to create the widget and widget's class might change if configured so in container configuration. But get_called_class always returns WidgetA in end() and wouldn't match the widget's class created in begin() if reconfigured. 0dbc4d3 tried to fix this but didn't consider scenario where container configuration is callable.

[rob006]

I mean we could this in begin():

self::$resolvedClasses[get_called_class()] = get_class($widget);

and this in end():

$calledClass = self::$resolvedClasses[get_called_class()] ?? get_called_class();

then we could remove these lines completely:

yii2/framework/base/Widget.php

Lines 108 to 110 in 3c75ff1

	if (Yii::$container->has($calledClass) && isset(Yii::$container->getDefinitions()[$calledClass]['class'])) {
	$calledClass = Yii::$container->getDefinitions()[$calledClass]['class'];
	}

[jrajamaki]

I mean we could this

Seems good, this is something what I had in my mind

public static function end()
{
    if (empty(self::$stack)) {
        throw new InvalidCallException('Unexpected ' . get_called_class() . '::end() call. A matching begin() is not found.');
    }

    $widget = array_pop(self::$stack);
    $calledClass = get_called_class();

    if (Yii::$container->has($calledClass)) {
        $definition = Yii::$container->getDefinitions()[$calledClass];
        if (is_callable($definition)) {
            $reflection = new \ReflectionFunction($definition);
            $returnType = $reflection->getReturnType();
            if ($returnType && $returnType instanceof \ReflectionNamedType) {
                $calledClass = $returnType->getName();
            } else {
                unset($calledClass);
            }
        } elseif (isset($definition['class'])) {
            $calledClass = $definition['class'];
        }
    }

    if (isset($calledClass) && get_class($widget) !== $calledClass) {
        throw new InvalidCallException('Expecting end() of ' . get_class($widget) . ', found ' . $calledClass);
    }

    /* @var $widget Widget */
    if ($widget->beforeRun()) {
        $result = $widget->run();
        $result = $widget->afterRun($result);
        echo $result;
    }

    return $widget;
}

but using self::$resolvedClasses seems more straightforward.