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run code in 150+ php & hhvm versions
Bugs & Features
<?php interface IWidget { } class WidgetA implements IWidget { } class WidgetB implements IWidget { } interface IWidgetFactory { function tryCreateWidget($someInput, IWidget &$widget = null); } class WidgetAFactory implements IWidgetFactory { public function tryCreateWidget($someInput, IWidget &$widget = null) { if ($someInput < 7) { $widget = new WidgetA(); return true; } return false; } } class WidgetBFactory implements IWidgetFactory { public function tryCreateWidget($someInput, IWidget &$widget = null) { if ($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 &$widget = null) { foreach ($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; } var_dump("Failed to create widget for {$someInput}"); break; }
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL NULL NULL string(29) "Failed to create widget for 9"
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/iSsIQ on line 56
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/iSsIQ on line 56
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/iSsIQ on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/iSsIQ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/iSsIQ on line 3
Process exited with code 255.