eh.php

<?php
class EventHandler.php {
    private $handlerClass;
    public function __construct(string $handlerClass) {
        $this->handlerClass = $handlerClass
    }
    
    public function __invoke(... $args) {
        $instance = new {$this->handlerClass};
        $instance->handle(... $args);
    }
}

// Usage
$config = [
        'on afterLogin' => new EventHandler(AfterLoginHandler::class)
    ]

Note this is pseudo code :)

And EventHandlerInterface? ;)