Solved Target the name of player from an other function

PHP:

public $cache = [];
public function mainForm(Player $player){
        $form = $this->createSimpleForm(function (Player $event, array $data){
        $player = $event->getPlayer();
        $result = $data[0];
        if($result !== null){
        }

        switch($result){
            case 0:
            break;
            default:
                $player->sendMessage("You clicked on " . $this->cache[$player->getName()][($result - 1)] . " !"); /* get the name of the player from the array */
                unset($this->cache[$player->getName()]); /* unset the player from the array to save memory */
            break;
        }
        });
        $form->setTitle(TextFormat::GREEN . "--= " . TextFormat::BLACK . "AdminUI" . TextFormat::GREEN . " =--");
        $form->setContent(TextFormat::RED . "Choose a player from the below list");
        $form->addButton("=none=");
        foreach($this->getServer()->getOnlinePlayers() as $online){
            $name = $online->getName();
            $this->cache[$player->getName()][] = $name; /* save each name in the array corresponding to the player in the order they appear on the form */
            $form->addButton(TextFormat::BLACK . "--=" . TextFormat::RED . $name . TextFormat::BLACK . "=--");
        }
        $form->sendToPlayer($player);
    }

Not tested but it should work.

 

That work tank you master