Programmatically create multiple taxonomy terms in Drupal 8

bar.php

<?php
// Programmatically create taxonomy terms for taxonomy module on install.
// This is the bar.install file included in a module.

use Drupal\taxonomy\Entity\Term;
use Symfony\Component\Yaml\Yaml;


function foo_taxonomy_install() {
  $vocabularies = [
    'bar',
    'bazz',
  ];
  foreach ($vocabularies as $vocabulary) {
    foo_taxonomy_import_term_data_for_vocabulary($vocabulary);
  }
}

function foo_taxonomy_get_term_data($vocabulary) {
  $terms_file_path = file_get_contents(drupal_get_path('module', 'foo_taxonomy') . '/vocabulary_data/' . $vocabulary . '.terms.yml');
  return Yaml::parse($terms_file_path);
}

function foo_clean_term_for_url($term_name_url) {
  $term_name_url = strtolower(preg_replace('/-+/', '-', preg_replace('/([^a-zA-Z0-9\-]+)/', '-', $term_name_url)));
  return $term_name_url;
}

function foo_taxonomy_import_term_data_for_vocabulary($vocabulary) {
  $terms_info = foo_taxonomy_get_term_data($vocabulary);
  $preexisting_terms = [];
  foreach ($terms_info as $term_name => $termInfo) {
    $term = array_pop(taxonomy_term_load_multiple_by_name($term_name, $vocabulary));
    if (!$term) {
      $data = [
        'vid' => $vocabulary,
        'name' => $term_name,
        'description' => [
          'value' => 'The term: ' . $term_name . ' belongs to the ' . $vocabulary . ' taxonomy vocabulary.',
          'format' => 'full_html',
        ],
      ];
      if (!empty($termInfo)) {
        if (!empty($termInfo['parent'])) {
          if ($preexisting_terms[$termInfo['parent']]) {
            $data['parent'] = [$preexisting_terms[$termInfo['parent']]];
          }
          else {
            $message = "The parent term {$termInfo['parent']} did not exist when trying to create {$term_name} in vocabulary {$vocabulary}.";
            drupal_set_message($message, 'error');
            \Drupal::logger('foo_taxonomy')->error($message);
          }
        }
        if (!empty($termInfo['fields'])) {
          foreach ($termInfo['fields'] as $field_name => $field_value) {
            $data[$field_name] = $field_value;
          }
        }
      }
      $term = Term::create($data);
      $term->save();
    }
    $preexisting_terms[$term->getName()] = $term->id();
    //clean and save taxonomy term name for url.
    $term_name_url = foo_clean_term_for_url($term_name);
    $vocabulary_url = foo_clean_term_for_url($vocabulary);
    \Drupal::service('path.alias_storage')
      ->save("/taxonomy/term/" . $term->id(), "/" . $vocabulary_url . "/" . $term_name_url, "en");
  }
}

/*
 * Just in case we want to delete terms. Do not delete terms on uninstall unless you specifically know you want to.
 * Be careful of deleting taxonomy terms, because they provide structure of the site. Change 'department' to the vocabulary you wish to delete.
 */
//function foo_taxonomy_remove_created_terms() {
//  $terms_info = foo_taxonomy_get_term_data('department');
//  foreach ($terms_info as $term_name => $termInfo) {
//    $terms = taxonomy_term_load_multiple_by_name($term_name);
//    foreach ($terms as $term) {
//      $term->delete();
//    }
//  }
//}
//
//function foo_taxonomy_uninstall() {
//  foo_taxonomy_remove_created_terms();
//}

bar.yaml

# Subject Specialities Taxonomy terms.
'Area Studies':
'African Studies':
  parent: 'Area Studies'
'East Asian Studies':
  parent: 'Area Studies'
'Chinese Studies':
  parent: 'Area Studies'

Very nice. Thanks for sharing.

Very very nice. Thanks so much for sharing this.

Just a small note. the file name bar.yaml should be bar.terms.yml

Thanks