<?php

namespace Drupal\form_multi_submit\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\user\Entity\User;

class MultiSubmitForm extends FormBase {

  public function getFormId() {
    return 'MultiSubmitForm';
  }

  public function buildForm(array $form, FormStateInterface $form_state) {

    // Get all users from database
    $ids = \Drupal::entityQuery('user')
      ->condition('status', 1)
      ->execute();
    $users = User::loadMultiple($ids);

    // Set form table header
    $form['users'] = array (
      '#type' => 'table',
      '#header' => array('ID', 'Remove'),
    );


    // Loop through all users
    foreach ($users as $user) {

      // Show user ID
      $form['users'][$user->id()]['id'] = array(
        '#type' => 'label',
        '#title' => $user->id(),
      );

      // Show button for each user
      $form['users'][$user->id()]['removememberbutton']['dummyNode'] = array(
        '#type' => 'submit',
        '#value' => 'Check',
        '#submit' => array([$this, 'removeMember']),
      );
    }

    return $form;
  }


  // Submit handler
  public function removeMember(array &$form, FormStateInterface $form_state) {
    $userid = $form_state->getTriggeringElement()['#array_parents'][1];
    drupal_set_message($userid, 'status');
  }

  public function validateForm(array &$form, FormStateInterface $form_state) {
    // Nothing to do here.
  }

  public function submitForm(array &$form, FormStateInterface $form_state) {
    // Nothing to do here.
  }

}