Command to function

How can I set the command to edit the $args I set up most of it I just dont know what to use to edit the args.

PHP:

class Main extends PluginBase implements Listener{

  public function onEnable() {
     $this->getServer()->getPluginManager()->registerEvents($this,$this);      
  }
 
  public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args): bool {
      if($cmd == "Knockback"){
       
   
  }
 
  public function onDamage(EntityDamageEvent $event){
    $event->getEntity()->setMotion(new Vector3($args[0],$args[1]],0.3));
  }
}


 

btw, I suggest you go learn php first.
anyways here's the "solution" (temporary, not saved to disk currently)

PHP:

class Main extends PluginBase implements Listener{
  private $args = [1, 1]; //default vals
  public function onEnable() {
     $this->getServer()->getPluginManager()->registerEvents($this,$this);     
  }
 
  public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args): bool {
      if($cmd->getName() == "knockback"){
            if(is_numeric($args[0]) && is_numeric($args[1]) & is_numeric($args[2])){
                $this->args = $args;
            }
      }
  }
 
  public function onDamage(EntityDamageEvent $event){
    $event->getEntity()->setMotion(new Vector3($this->args[0],$this->args[1]],0.3));
  }
}


 

And also int-cast the args.

PHP:

array_map("intval", $args);