Solved Command args

How do i accept arguments for example if the player type

/broadcast Hello everyone

then it would broadcast "hello everyone"
In usage i have the command say
/broadcast msg
And heres my coding

PHP:

<?php

namespace FlamingGenius\MessageSystem;

use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\utils\Config;
use pocketmine\plugin\PluginBase;
use pocketmine\Server;


class main extends PluginBase{

 public function onEnable(){
  $this->saveDefaultConfig();

 }

 public function onCommand(CommandSender $sender, Command $command, $label, array $args){
  switch(strtolower($cmd = $command->getName();)){
   case "broadcast"
    $sender->broadcastMessage("Broadcast Test");
   break;
   
   case "tester"
    $sender->sendMessage("test message");
  }
 }



}

?>


PHP:

public function onCommand(CommandSender $sender, Command $command, $label, array $args){
  switch(strtolower($command->getName()){
   case "broadcast"
    $sender->broadcastMessage("Broadcast Test");
   break;
  
   case "tester"
    $sender->sendMessage("test message");
break;
  }
}


PHP:

$message = "";
foreach($args as $arg){
   $message = $message . $arg;
}
$this->getServer()->broadcastMessage($message);


This confuses me 0.o i dont understand how this would work in my plugin

PHP:

public function onCommand(CommandSender $sender, Command $command, $label, array $args){
  switch(strtolower($command->getName()){
   case "broadcast"
    $message  = "";
    foreach($args as $arg){
     $message = $message . $arg;
    }
    $sender->broadcastMessage($message);
    break;

   case "tester"
    $sender->sendMessage("test message");
    break;
  }
}

I got where it goes and understand the majority of this what i dont understand is why

PHP:

foreach($args as $arg)

Is needed

$args is an array, so you can't just do

PHP:

$this->getServer()->broadcastMessage($args);

Another way would be:

PHP:

if(count($args) == INT) {
  if(args[0] == "blah") {
  // Do something;
  return true;
}

  if(!isset($args[0])) { // To make it do something if the first array key is not correct (Can also work with the second, third, fourth...)
   // Do something;
  return true;
}


You can add how many args you want