Solved Create a countdown

hello can someone teach me how to count down?
In the quickest and simplest way of preference.

 

A repeating task of course.

PHP:

$this->getScheduler()->scheduleRepeatingTask(new Countdown($this), 20);


PHP:

<?php
namespace Namespace;
use pocketmine\scheduler\Task;
class Countdown extends Task{
    /** @var int $time */
    public $time = 10; //sets the countdown to 10 seconds

    public function __construct(MainFile $plugin){
        $this->plugin = $plugin;
    }

    public function onRun(int $currentTick) : void{
        $this->time--;
        echo "Time: ".$this->time;
        if($this->time == 0) $this->plugin->getScheduler()->cancelTask($this->getTaskId());
    }
}

 

10, 9, 8, 7, 6, 5, 4, 3, 2, 1

 

I cannot understand.


EDIT: Gotcha