Weak hands cannot be planted, meager skills have no foundation. Shallow wisdom is futile, how can one hope for a good name?扰扰从役倦，屑屑身事微。少壮轻年月，迟暮惜光辉。
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_f