Solved getLevelByName returning null

what's wrong with my code?
the level with the name Gorzen located on
PockeMine/worlds/world and Gorzen is the only world i have

PHP:

public function onCommand(CommandSender $sender, Command $command, string $label, array $args): bool {
        if(strtolower($command->getName()) == "world"){

        $world = $sender->getPlayer()->getLevel()->getName();//Gorzen
        var_dump($world);//Gorzen
        var_dump($this->getServer()->getLevelByName($world));//NULL
        var_dump($this->getServer()->getLevelByName('world'));//instanceof pocketmine\level\Level
        return true;
    }
  }


i made this post because my issue on github got closed https://github.com/pmmp/PocketMine-MP/issues/2778

 

Try this:

PHP:

$world = $sender->getLevel()->getFolderName();


Let me emphasize that levels are identified by their folder name and not their "display" name.
This is also why Server->getLevelByName("world") returns the desired Level object in your case. It's the correct name.

 

then shouldn't it be getLevelByFolderName();

PHP:

$world = $sender->getLevel()->getFolderName();
var_dump($this->getServer()->getLevelByName($world);


returned

Code:

string(6) "Gorzen"
object(pocketmine\level\Level)#10763 (0) {
}

 

You're absolutely right to point out this discrepancy, however, I personally would prefer to keep the shorter method name.
But in the upcoming backwards-incompatible version 4.0 your suggestion is (kind of) addressed in the following commit:
https://github.com/pmmp/PocketMine-MP/commit/e341f3dce233c60a7e5715bc0ec6f857675d4c73