Call a function of the API

I'm really sorry, I know this is simple but :
I can't find how to use the function setTime and stopTime of Level.php.

PHP:

public function changeTime(Level $setTime){
   


   
   
    $this->setTime(6000);
                $this->stopTime();
           
       
   
}

I didn't forget to use the Level file at the beginning of the code. It says :

Thank you and sorry once again !

The whole code?

Yes sorry

PHP:

<?php

namespace RealTime;

use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\Player;
use pocketmine\plugin\PluginBase;
use pocketmine\Server;
use pocketmine\utils\TextFormat;
use pocketmine\event\Listener;
use pocketmine\level\Level;

class MainClass extends PluginBase implements Listener{

    public function onLoad(){
        $this->getLogger()->info(TextFormat::WHITE . "RealTime loaded.");
    }

    public function onEnable(){
       
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
        $this->changeTime();                                                                            //    Schedule tell hour instead  after            
        $this->getLogger()->info(TextFormat::DARK_GREEN . "RealTime enabled.");
   
  
   
   
   
   

       
    }
   
   
    public function onDisable(){
        $this->getLogger()->info(TextFormat::DARK_RED . "RealTime disabled.");
    }

   
   
   

public function changeTime(Level $setTime){
   


   
   
    $this->setTime(6000);
                $this->stopTime();
           
       
   
}



public function tellTime(){

       
    $times = date('H');
    $minutes = date('i');
    $time = $times + ($modify);

        if ($time > 23){
        $time = $time - 24;
    }
   

$this->broadcast("[RealTime] It is ". $time .":". $minutes ."");
    }
   
   
   












}

I just don't understand why everyone wants to add a message "enabled" when there is already an "Enabling Plugin vVersion by Author" message.

Il just followed a plugin example available on github. Do you have any idea why it don't work ? Thanks

You called the function $this->changeTime() when you enable it, but you didn't pass parameters.

I only have one answer:
Learn PHP.

You're right, thanks. I finished the code academy tutorial, I think I will do it again.. Thanks anyways

I understand if you don't want to answer, but can somebody explain me which parameters do I have to put ? It will help me to undersatnd parameters. Thanks.

Try reading the DOCS a little more.

Am I far from what I want to do ? ^^ I found the function I want I think, but I can't find how to call it, will I find this in the docs ?

Thank you !!! I didn't need any parametres in fact, and I understood a very useful thing thanks to you )

You need no parameters. And you have no reason to put the Level $level parameter in the function declaration.

Yes sorry :/