Sub command

how to make sub commands ?

A good example: https://github.com/PocketMine/Pocke...cketmine/command/defaults/TimeCommand.php#L42

If you want a simpler method, use the default variable/array $args.
Since it is an array, get the first sub-command using the key 0 (Remember it starts with a 0).

PHP:

$args[0]

Use switch-case or an if:

PHP:

switch(strtolower($args[0])){
    case "help":
       break;
    case "blah":
       // ANYTHING
       break;
}

if($command->getName() == "mg"){
//how make sub command for command 'mg' , example '/mg help'
}

Understand the code. Use the array $args.

PHP:

if($command->getName() == "mg"){
    switch(strtolower($args[0])){
        case "help":
            $sender->sendMessage("Hi");
            break;
    }
}

Thanks :3
Sorry the my bad english , i from Russia

English does not matter You understand, then I am happy. Like?

Yes , of course