copy and rename world ?

With a pocketmine function how to copy a world ( exemple : copyworld ) and rename the copy with a custom name ( like "worldA") i need it in a function for a plugin. Like as onPlayerJoin....the plugins create a copy of the patern world and rename the copy with the player name. Can someone help me ?

Filesystem-related functions aren't related to PocketMine at all.

PHP:

function recursive_copyDir($from, $to){
  @mkdir($to, 0777, true);
  $from = rtrim($from, "/\\") . DIRECTORY_SEPARATOR;
  $to = rtrim($to, "/\\") . DIRECTORY_SEPARATOR;
  $dir = dir($from);
  while(($f = $dir->read()) !== false){
    $file = $from . $f;
    $toFile = $to . $f;
    if(is_dir($file)){
      recursive_copyDir($file, $toFile);
    }else{
      copy($file, $toFile);
    }
  }
}

I know but the name of the maps are not only in the directory name.

What do you mean?

The worlds have name, the name is in the level.dat, i would like know how to change it.

Unload it, create an NBT object, tell NBT to read level.dat using $nbt->readCompressed(), modify values inside it, reload level.

How to reload a level? It can crash

here
https://forums.pocketmine.net/threads/guide-renaming-copying-loading-worlds.8543/

please when can i find tutorial how work with files and folders?

http://php.net/filesystem

Thx