README

Yii Event

This package is a configuration wrapper for the yiisoft/event-dispatcher package. It is intended to make event listener declaration simpler than you could ever imagine. All you need is to use any PSR-11 compatible DI container.

Requirements

• PHP 8.1 or higher.

Installation

The package could be installed with Composer:

composer require yiisoft/yii-event

General usage

DI configuration

You can find default configuration in the config directory:

• di.php contains the configuration for the PSR-14 interfaces.
• di-web.php and di-console.php contains the configuration for the Yiisoft\EventDispatcher\Provider\ListenerCollection.
• params-web.php and params-console.php contains parameters for web and console configurations.

All these settings will be used automatically in projects with the yiisoft/config.

If you have custom events configuration group name, for example events-api, redefine it in the eventsConfigGroup params key.

params.php

return [
    'yiisoft/yii-event' => [
        'eventsConfigGroup' => 'events-api',
    ],
]

Event configuration example

The configuration is an array where keys are event names and values are array of handlers:

return [
    EventName::class => [
        // Just a regular closure, it will be called from the Dispatcher "as is".
        static fn (EventName $event) => someStuff($event),
        
        // A regular closure with additional dependency. All the parameters after the first one (the event itself)
        // will be resolved from your DI container within `yiisoft/injector`.
        static fn (EventName $event, DependencyClass $dependency) => someStuff($event),
        
        // An example with a regular callable. If the `staticMethodName` method contains some dependencies,
        // they will be resolved the same way as in the previous example.
        [SomeClass::class, 'staticMethodName'],
        
        // Non-static methods are allowed too. In this case `SomeClass` will be instantiated by your DI container.
        [SomeClass::class, 'methodName'],
        
        // An object of a class with the `__invoke` method implemented
        new InvokableClass(),
        
        // In this case the `InvokableClass` with the `__invoke` method will be instantiated by your DI container
        InvokableClass::class,
        
        // Any definition of an invokable class may be here while your `$container->has('the definition)` 
        'di-alias'
    ],
];

The dependency resolving is done in a lazy way: dependencies will not be resolved before the corresponding event will happen.

Configuration checker

To help you with event listener configuration validation there is the ListenerConfigurationChecker. It is converting your whole listener config to actual callables at once to validate it. It is intended to be used in development environment or in tests since it is a resource greedy operation in large projects. An InvalidEventConfigurationFormatException will be thrown if your configuration contains an invalid listener.

Usage example:

$checker->check($configuration->get('events-web'));

Documentation

• Internals

If you need help or have a question, the Yii Forum is a good place for that. You may also check out other Yii Community Resources.

License

The Yii Event is free software. It is released under the terms of the BSD License. Please see LICENSE for more information.

Maintained by Yii Software.

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