Online PHP editor | refs for QKvIW

<?php interface IWidget { } class WidgetA implements IWidget { } class WidgetB implements IWidget { } interface IWidgetFactory { function tryCreateWidget($someInput, IWidget &$widget); } class WidgetAFactory implements IWidgetFactory { public function tryCreateWidget($someInput, IWidget &$widget) { if ($someInput < 7) { $widget = new WidgetA(); return true; } return false; } } class WidgetBFactory implements IWidgetFactory { public function tryCreateWidget($someInput, IWidget &$widget) { if ($someInput > 10) { $widget = new WidgetB(); return true; } return false; } } class WidgetFactoryAggregate implements IWidgetFactory { private $widgetFactories = []; function __construct(array $widgetFactories) { $this->widgetFactories = $widgetFactories; } public function tryCreateWidget($someInput, IWidget &$widget) { foreach ($this->widgetFactories as $widgetFactory) { if ($widgetFactory->tryCreateWidget($someInput)) { return true; } } return false; } } $widgetFactory = new WidgetFactoryAggregate([ new WidgetAFactory(), new WidgetBFactory(), ]); foreach ([1, 5, 15, 9] as $someInput) { $widget = null; if ($widgetFactory->tryCreateWidget($someInput, $widget)) { var_dump($widget); continue; } throw new Exception("Failed to create widget for {$someInput}"); }