<?php

require '../wp-load.php';

$taxonomies = [ 'category' => [
    [
        'name'        => 'Catégorie 1',
        'slug'        => 'cat-1',
        'parent'      => false,
        'description' => 'C’est ma catégorie',
        'meta'        => [ 'extId' => '12' ], // new
    ],
    [
        'name'        => 'Catégorie 2',
        'slug'        => 'cat-2',
        'parent'      => 'cat-1',
        'description' => 'C’est ma sous-catégorie',
        'meta'        => [ 'extId' => '14', 'old_uri' => '/categorie/foo/bar/' ],  // new
    ],
] ];

foreach ( $taxonomies as $tax => $terms ) {
    foreach ( $terms as $term ) {
        if ( $term['parent']
          && $parent = term_exists( $term['parent'], $tax ) ) {
            $term['parent'] = $parent['term_id'];
        }
        $t = wp_insert_term( $term['name'], $tax, $term );

        // -> add meta
        if ( is_wp_error( $t ) ) return false;
        if ( ! empty( $term['meta'] ) ) {
            foreach ( $term['meta'] as $key => $meta ) {
                update_term_meta( $t['term_id'], $key, $meta );
            }
        }
    }
}