Duplicating worlds

What is the fastest way to duplicate a world directory?

Or can someone just make a plugin or write a code about writing directories to a new directory?

OK Nvm it is very fast already using this:

PHP:

<?php

/*
__PocketMine Plugin__
class=Reproducer
name=WorldReproducer
author=PEMapModder
version=0
apiversion=11,12
*/

class PvpMinigame implements Plugin{
    public $s;
    public function __construct(ServerAPI $a,$s=0){
        $this->s=ServerAPI::request();
    }
    public function init(){
        $s=$this->s;
        $s->handle("hub.minigame.register", $this);
        $this->reproduceWorld(1);
        $this->reproduceWorld(2);
    }
    public function reproduceWorld($id){
        console("[DEBUG] Producing PvP temp world $id");
        if($id==1 and is_dir(PVP_WORLD_TEMP_ONE)){
            return true;
        }
        if($id==2 and is_dir(PVP_WORLD_TEMP_TWO)){
            return true;
        }
        $out=(($id===1)?PVP_WORLD_TEMP_ONE:PVP_WORLD_TEMP_TWO);
        mkdir($out);
        $in=dir(PVP_ORIGINAL_WORLD);
        console("[DEBUG] Copying from ".PVP_ORIGINAL_WORLD." to $out");
        while(false!==($file=$in->read())){
            if(is_file(PVP_ORIGINAL_WORLD.$file)){
                console("[DEBUG] Copying file from ".PVP_ORIGINAL_WORLD.$file." to $out".$file);
                file_put_contents($out.$file, file_get_contents(PVP_ORIGINAL_WORLD.$file));
            }
        }
        $chunksIn=PVP_ORIGINAL_WORLD."chunks/";
        $chunksOut=PVP_ORIGINAL_WORLD."chunks/";
        $inDir=dir($chunksIn);
        mkdir($chunksOut);
        while(false!==($chunk=$inDir->read())){
            if(is_file($chunksIn.$chunk)){
                console("[DEBUG] Copying chunk from ".$chunksIn.$chunk." to $chunksOut".$chunk);
                file_put_contents($chunksOut.$chunk, file_get_contents($chunksIn.$chunk));
            }
        }
        console("[NOTICE] Finished producing temp world $id");
    }
    public function __destruct(){
       
    }
    public function getName(){return "PvP";}
    public function getWorldNames(){return array("pvp_1","pvp_2");}
    public function getMaxPlayers(){return array(100,100);}
    public function getJoinStatus(){
       
    }
    public function getPlayerList(){
       
    }
    public function pmPlayerEvt($evt, Player $p, $data){
       
    }
}


And strangely fast (and strangely fast spamming console )