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Informations about the package event

Brick\Event

A simple event dispatching mechanism.

Build Status Coverage Status Latest Stable Version License

Introduction

This library helps to write extensible software by plugging in external listeners to events dispatched by an application.

Installation

This library is installable via Composer:

Requirements

This library requires PHP 7.1 or later.

Overview

This package provides the EventDispatcher. The dispatcher dispatches events: an event is a unique string along with optional parameters. The events are intercepted by listeners: any callable can be an event listener.

Basic usage

Let's instantiate a dispatcher:

use Brick\Event\EventDispatcher;

$dispatcher = new EventDispatcher();

And add a few listeners:

$dispatcher->addListener('startup', function() {
    echo 'Caught startup event';
});

$dispatcher->addListener('shutdown', function() {
    echo 'Caught shutdown event';
});

Now, let's dispatch some events:

$dispatcher->dispatch('startup'); // will display "Caught startup event"
$dispatcher->dispatch('shutdown'); // will display "Caught shutdown event"

Any additional parameters you pass to dispatch() are forwarded to the listeners:

$dispatcher->addListener('test', function($a, $b) {
    echo "Caught $a and $b";
});

$dispatcher->dispatch('test', 'Hello', 'World'); // will display "Caught Hello and World"

Setting priorities

By default, the listeners are called in the order they have been registered. It is possible to bypass this natural order by passing a priority to addListener():

$dispatcher->addListener('startup', function() { ... }, 10);

The default priority is 0. The listeners with the highest priority will be called first in the chain. Two listeners with the same priority will be called in the order they have been registered.

Stopping event propagation

Any listener can decide that the event should not be propagated to further listeners in the chain, by returning false:

$dispatcher->addListener('startup', function() {
    // ...

    return false;
});

The dispatcher will then break the chain and no further listeners will be called for this event.


All versions of event with dependencies

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Package Version
Requires php Version >=7.1
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