Part 4: The final.
The factory is useful if you need to create objects using definition syntax and/or want to configure defaults for objects created.
$container = new PSR11DependencyInjectionContainer(); $factoryConfig = [ EngineInterface::class => [ 'class' => EngineMarkOne::class, '__construct()' => [ 'power' => 42, ], ] ]; $factory = new Factory($container, $factoryConfig); $one = $factory->create(EngineInterface::class); $two = $factory->create( [ 'class' => EngineInterface::class, '__construct()' => [ 'power' => 146, ], ], );
In the code above we define factory config specifying that when we need
EngineInterface, an instance of
EngineMarkOne will be created with
power constructor argument equals to 42. We also specify that all the dependencies requested by the object created should be resolved by
First call to
create() uses default configuration of
EngineInterface as is. Second call specifies custom configuration for
power constructor argument. In this case, configuration specified is merged with default configuration overriding its keys when the key name is the same.
composer create-project --prefer-dist --stability=dev yiisoft/app app-template
Welcome to Yii3.