pmformsでオートコンプリート実装例(非公式ブランチ)

test.php

<?php

use dktapps\pmforms\CustomForm;
use dktapps\pmforms\CustomFormResponse;
use dktapps\pmforms\element\Input;
use pocketmine\Player;

$form = new CustomForm(
    "example",
    [
        new Input(
            "test1",
            "please input number"
        ),
    ],
    function (Player $player, CustomFormResponse $response) use (&$form): void {
        /** @var CustomForm $form */
        $test1Response = $response->getString("test1");
        if (preg_match("/^[0-9]+$/", $test1Response) !== 1) {
            /** @var Input $test1Element */
            $test1Element = $form->getElementByName("test1");
            $test1Element->setDefaultText($test1Response);
            $player->sendMessage("\"$test1Response\" is not an number!");
            $player->sendForm($form);
            return;
        }
        $player->sendMessage("ok! input: " . $test1Response);
    }
);

/** @var Player $player */
$player->sendForm($form);