Drupal 8 - récupérer l'arborescence des termes

gistfile1.txt

<?php

namespace Drupal\mon_module\Tools

use Drupal\taxonomy\Entity\Term;

/**
 * Service de récupération d'arborescence de termes
 *
 * @package Drupal\mon_module\Tools
 */
class IteratifService {

  /**
   * Load Vocabulary Tree.
   *
   * @param string $vid
   *   Vocabulary ID to retrieve terms for.
   * @param int $parent
   *   The term ID under which to generate the tree.
   * @param int $max_depth
   *   The number of levels of the tree to return.
   *
   * @return array
   *   Return array
   */
  public function loadVocabularyTree($vid, $parent = 0, $max_depth = NULL) {

    // Get tree.
    /** @var \Drupal\taxonomy\TermStorage $taxonomy_storage */
    $taxonomy_storage = \Drupal::service('entity_type.manager')
      ->getStorage('taxonomy_term');
    $taxonomy = $taxonomy_storage->loadTree($vid, $parent, $max_depth, FALSE);

    // Get terms of the passed vid.
    $terms = $taxonomy_storage->loadByProperties(['vid' => $vid]);

    // Init result array.
    $result = [];

    foreach ($taxonomy as $taxo) {
      if ($taxo->depth == 0) {
        $result[$taxo->tid] = $terms[$taxo->tid];
      }
      else {
        foreach( $taxo->parents as $parentId ){
          if ($parentId != 0 && array_key_exists($parentId, $terms)) {
            if (!is_array($terms[$parentId]->children)) {
              $terms[$parentId]->children = [];
            }
            $terms[$parentId]->children[$taxo->tid] = $terms[$taxo->tid];
          }
        }
      }
    }
    return $result;
  }
}

Construction de l'arbre de manière itérative (plus performante) vs manière récursive :

• https://holidev.thomas-secher.fr/drupal-8/drupal-8-recuperer-larborescence-des-termes-comparatif.html
• https://www.webomelette.com/loading-taxonomy-terms-tree-drupal-8