WordPress - Adding Custom Post Types & Taxonomies

<?php

add_action('init', 'hoog_register_post_types');
function hoog_register_post_types()
{
    $supports = [
        'title', // post title
        'editor', // post content
        'author', // post author
        'thumbnail', // featured images
        'excerpt', // post excerpt
        'revisions', // post revisions
        'post-formats', // post formats
    ];
    
    $labels = [
        'name' => _x('vacancies', 'plural'),
        'singular_name' => _x('vacancy', 'singular'),
        'menu_name' => _x('vacancies', 'admin menu'),
        'name_admin_bar' => _x('vacancy', 'admin bar'),
        'add_new' => _x('Add New', 'add new'),
        'add_new_item' => __('Add Vacancy'),
        'new_item' => __('New Vacancy'),
        'edit_item' => __('Edit vacancy'),
        'view_item' => __('View vacancy'),
        'all_items' => __('All vacancies'),
        'search_items' => __('Search vacancies'),
        'not_found' => __('No vacancies found.'),
    ];
    
    $args = [
        'supports' => $supports,
        'labels' => $labels,
        'public' => true,
        'query_var' => true,
        'rewrite' => array('slug' =&gt; 'vacancies'),
        'has_archive' => true,
        'hierarchical' => false,
    ];
    
    register_post_type('vacancies', $args);
}

add_action( 'init', 'hoog_register_taxonomies', 0 );
function hoog_register_taxonomies()
{

    $labels = [
        'name' => _x('sectors', 'taxonomy general name'),
        'singular_name' => _x('Sector', 'taxonomy singular name'),
        'search_items' => __('Search Sectors'),
        'all_items' => __('All Sectors'),
        'parent_item' => __('Parent Sector'),
        'parent_item_colon' => __('Parent Sector:'),
        'edit_item' => __('Edit Sector'),
        'update_item' => __('Update Sector'),
        'add_new_item' => __('Add New Sector'),
        'new_item_name' => __('New Sector Name'),
        'menu_name' => __('Sectors'),
    ];
    // Add new "Locations" taxonomy to Posts
    register_taxonomy('sector', 'post', [
        // Hierarchical taxonomy (like categories)
        'hierarchical' => true,
        // This array of options controls the labels displayed in the WordPress Admin UI
        'labels' => $labels,
        // Control the slugs used for this taxonomy
        'rewrite' = [
            'slug' = 'sectors', // This controls the base slug that will display before each term
            'with_front' => true,
            'hierarchical' => true
        ],
    ]);
}