Get all players name ForamAPI.

Hi the developers.
I would like to do a plugin with FormAPI but here I am blocking.
how can I get the name of all online players in buttons

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PHP:

public function mainFrom($player){
        $api = $this->getServer()->getPluginManager()->getPlugin("FormAPI");
        $form = $api->createSimpleForm(function (Player $event, array $data){
        $player = $event->getPlayer();
        $result = $data[0];
        if($result === null){
        }
        switch($result){                           
            case 0:
            break;
            case 1:
            break;
            }                   
        });                   
        $form->setTitle("--= " . "AdminUI" . " =--");
        $form->setContent("Make your choose.");
        foreach($this->getServer()->getOnlinePlayers() as $online){
            $name = $online->getName();
            $form->addButton($name);
            $form->sendToPlayer($player);
        }
    }

 

Don't use $form->sendToPlayer() inside of foreach() loop

 

Thx you but i have an other issu.
How get ne player name who was target

 

Do var_dump($data);
You have to check for result number which is not null