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<?php
namespace Automattic\WooCommerce\Blueprint;
trait UsePubSub {
/**
* Subscribers.
*
* @var array
*/
private array $subscribers = array();
/**
* Subscribe to an event with a callback.
*
* @param string $event The event name.
* @param callable $callback The callback to execute when the event is published.
* @return void
*/
public function subscribe( string $event, callable $callback ): void {
if ( ! isset( $this->subscribers[ $event ] ) ) {
$this->subscribers[ $event ] = array();
}
$this->subscribers[ $event ][] = $callback;
}
/**
* Publish an event to all subscribers.
*
* @param string $event The event name.
* @param mixed ...$args Arguments to pass to the callbacks.
* @return void
*/
public function publish( string $event, ...$args ): void {
if ( ! isset( $this->subscribers[ $event ] ) ) {
return;
}
foreach ( $this->subscribers[ $event ] as $callback ) {
call_user_func( $callback, ...$args );
}
}
/**
* Unsubscribe a specific callback from an event.
*
* @param string $event The event name.
* @param callable $callback The callback to remove.
* @return void
*/
public function unsubscribe( string $event, callable $callback ): void {
if ( ! isset( $this->subscribers[ $event ] ) ) {
return;
}
$this->subscribers[ $event ] = array_filter(
$this->subscribers[ $event ],
fn( $subscriber ) => $subscriber !== $callback
);
if ( empty( $this->subscribers[ $event ] ) ) {
unset( $this->subscribers[ $event ] );
}
}
}