restart WORLD

Can anyone help me? What is the code for this?

Do you want to RELOAD worlds?
Simply unload it and then load it again!

No. I need codes -.-

PHP:

$this->getLevelByName("lol")->unload();
$this->getLevelByName("lol")->load();


This does not remove the level from the server. This finalizes the level, but only Server::unloadLevel() properly removes the reference from the server to the level.

But then you can't load it anymore lol

What?
One level instance represents once the level gets loaded. If two level references are the same object, the level isn't reloaded.

Why "can't load it anymore"? If you properly reload something, you are getting it completely fresh, just like it was never loaded before.

PHP:

$this->getLevelByName("lol")->unload();
$this->getLevelByName("lol")->load();


That does UNLOAD it and then LOAD it! what's wrong with it?

LOL Did understand it now

PHP:

  380  public function unload($force = false){
LevelUnloadEvent($this);
getName() . "\"");
getPlayers() as $player){
Level){
  400  $player->teleport($this->server->getDefaultLevel()->getSafeSpawn());
  401  }
  402  }
  403 
  404  if($this === $defaultLevel){
  405  $this->server->setDefaultLevel(null);
  406  }
  407 
  408  $this->close();
  409 
  410  return true;
  411  }


It just kicks the player out of the world!

They are internal methods used by PocketMine internal implementation to properly free the resources.
If you unload() then load(), it is indeed a "reload", but that doesn't do the purpose of a reloading, that is to create an entirely new loading of the level.
Level is not a dummy object used merely for references. It is an actual object that has contents inside it that have to be freed properly.

Also, unload() calls close(), which frees the level provider, hence the level data. On the other hand, load() tries to load data using the level provider initialized in constructor, but unload() destroyed the level provider.
unload() and load() are just internal handler-like functions that are called when unloading and loading.

I still do have to learn much about php and pocketmine
But how to do it the right way?

Are you trying to restore a world from a backup or reload(unload and load) a world?

Restore a world .. Like reset floor ..

PHP:

public function backupExists($wname){
        return is_file($this->getServer()->getDataPath()."worlds/$wname - Backup/level.dat");
    }

public function reset($world){
        if($world instanceof Level){
            $wname = $world->getName();
if(!$this->backupExists($wname)) return false;
            $spawn = $this->getServer()->getDefaultLevel()->getSafeSpawn();
            foreach($world->getPlayers() as $p){
                $p->teleport($spawn);
                $p->sendMessage(TextFormat::GOLD."- Restoring current world, teleporting you to spawn");
            }
            $this->getServer()->unloadLevel($world);
        }
        $path = $this->getServer()->getDataPath();
        $this->recurse_copy($path."worlds/$wname - Backup",$path."worlds/$wname");
//$this->getServer()->loadLevel($wname); //optionally load level 
        return true;
    }


public function recurse_copy($src,$dst){
        $dir = opendir($src);
        @mkdir($dst);
        while(false !== ( $file = readdir($dir)) ) {
            if (( $file != '.' ) && ( $file != '..' )) {
                if ( is_dir($src . '/' . $file) ) {
                    $this->recurse_copy($src . '/' . $file,$dst . '/' . $file);
                }
                else {
                    copy($src . '/' . $file,$dst . '/' . $file);
                }
            }
        }
        closedir($dir);
    }


Ok thanks.