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if (class_exists('Memcached', FALSE)) {
  $class_loader->addPsr4('Drupal\\memcache\\', 'modules/contrib/memcache/src');

  $settings['bootstrap_container_definition'] = [
    'parameters' => [],
    'services' => [
      'settings' => [
        'class' => 'Drupal\Core\Site\Settings',
        'factory' => 'Drupal\Core\Site\Settings::getInstance',
      ],

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$values = FieldConfig::loadByName('node', 'BUNDLE', 'FIELD')->getSetting('allowed_values');

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<?php

namespace Drupal\my_module\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Class TestAjaxFormSelect.
 */

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<?php
/**
 * @file
 * Contains \Drupal\hello_world\Form\AddAnotherItem.
 */

namespace Drupal\hello_world\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

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<?php

use Drupal\Core\Menu\MenuLinkTreeInterface;
use Drupal\Core\Menu\MenuTreeParameters;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
  * The menu link tree service.
  *
  * @var \Drupal\Core\Menu\MenuLinkTree

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#
# This is an example VCL file for Varnish.
#
# It does not do anything by default, delegating control to the
# builtin VCL. The builtin VCL is called when there is no explicit
# return statement.
#
# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/
# and https://www.varnish-cache.org/trac/wiki/VCLExamples for more examples.

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Step #1

Cretae file in the next path /usr/bin/localhost_sendmail

Step #2

Add to the new file this below content:

#!/bin/sh
prefix="/var/mail/sendmail"

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{
    "name": "drupal/drupal",
    "description": "Drupal is an open source content management platform powering millions of websites and applications.",
    "type": "project",
    "license": "GPL-2.0-or-later",
    "require": {
        "composer/installers": "^1.0.24",
        "wikimedia/composer-merge-plugin": "^1.4",
        "cweagans/composer-patches": "^1.6",
        "symfony/var-dumper": "3.*",

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<?php

/**
 * Implements hook_preprocess_views_view_field().
 */
function MODULE_preprocess_views_view_field(&$variables) {
  /** @var \Drupal\views\ViewExecutable $view */
  $view = $variables['view'];
  if ($view->id() == 'schedule') {
    if ($view->current_display == 'embed_1') {

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<?php
$manager = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
$tree = $manager->loadTree('VOC_NAME', 0, 0, TRUE);
foreach ($tree as $term) {
  $term->setWeight(0);
  $term->save();
}