HummingBirdAnimeClient/src/Ion/Event.php

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<?php declare(strict_types=1);
/**
* Hummingbird Anime List Client
*
* An API client for Kitsu to manage anime and manga watch lists
*
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* PHP version 8
*
* @package HummingbirdAnimeClient
* @author Timothy J. Warren <tim@timshomepage.net>
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* @copyright 2015 - 2021 Timothy J. Warren
* @license http://www.opensource.org/licenses/mit-license.html MIT License
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* @version 5.2
* @link https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
*/
namespace Aviat\Ion;
/**
* A basic event handler
*/
class Event
{
private static array $eventMap = [];
/**
* Subscribe to an event
*/
public static function on(string $eventName, callable $handler): void
{
if ( ! array_key_exists($eventName, static::$eventMap))
{
static::$eventMap[$eventName] = [];
}
static::$eventMap[$eventName][] = $handler;
}
/**
* Fire off an event
*/
public static function emit(string $eventName, array $args = []): void
{
// Call each subscriber with the provided arguments
if (array_key_exists($eventName, static::$eventMap))
{
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array_walk(static::$eventMap[$eventName], static fn ($fn) => $fn(...$args));
}
}
}