<?php 

function add_custom_taxonomies() {
  register_taxonomy('thematiques', 'post', array(

    // 'hierarchical' => true,

    // This array of options controls the labels displayed in the WordPress Admin UI
    'labels' => array(
      'name' => _x( 'Thématiques', 'taxonomy general name' ),
      'singular_name' => _x( 'Thématique', 'taxonomy singular name' ),
      'search_items' =>  __( 'Chercher une Thématique' ),
      'all_items' => __( 'Toutes les Thématiques' ),
      'parent_item' => __( 'Thématique Parent' ),
      'parent_item_colon' => __( 'Thématique Parent:' ),
      'edit_item' => __( 'Editer la Thématique' ),
      'update_item' => __( 'Mettre à jour la Thématique' ),
      'add_new_item' => __( 'Ajouter une Thématique' ),
      'new_item_name' => __( 'Nom de la nouvelle Thématique' ),
      'menu_name' => __( 'Thématiques' ),
    ),
    // Control the slugs used for this taxonomy
    'rewrite' => array(
      'slug' => 'thematiques', // This controls the base slug that will display before each term
      // 'with_front' => false, // Don't display the category base before "/locations/"
      'hierarchical' => true // This will allow URL's like "/locations/boston/cambridge/"
    ),
  ));
}
add_action( 'init', 'add_custom_taxonomies', 0 );