How do i use command arguments

How do you use command arguments?

Use use $args[arg]
Example:

PHP:

public function cmd($cmd, $args, $issuer){
   if($cmd=="broadcaster"){
      if(isset($args[0])){
         if($args[0]=="add"){
            $msg=null;
            for($i=1;$i<count($args);$i++){
               $msg .= $args[$i]." ";
            }
            $issuer->sendChat("Message ".$msg." has been added!");
         }else $issuer->sendChat("Usage: /broadcaster add <msg>"):
      }else $issuer->sendChat("Usage: /broadcaster add <msg>");
   }
}