How to update value by Events in CodeIgniter 4

Here is my code:

\app\Controllers\My_controller.php

PHP Code:

namespace App\Controllers;

use CodeIgniter\Events\Events;

class My_controller extends App_Controller {

    function __construct() {
        parent::__construct();
        require_once(APPPATH . "update_value.php");
    }

    function index() {
        $array = array("foo", "bar");
        Events::trigger('add_value_to_array', $array);

        print_r($array);
    }

} 


\app\update_value.php

PHP Code:

use CodeIgniter\Events\Events;

Events::on('add_value_to_array', function($array) {
    error_log("add_value_to_array" . PHP_EOL, 3, "events.txt");
    array_push($array, "new");
    return $array;
}); 


I'm getting this output:

PHP Code:

Array ( [0] => foo [1] => bar ) 


But it's triggering the event because it's giving a log containing this text:

Code:

add_value_to_array

I want the updated array containing the 'new' item. My expected result:

PHP Code:

Array ( [0] => foo [1] => bar [2] => new  ) 


Is it possible? Thanks in advance.