/***** Creates "Page Categories" Taxonomy for pages *****/
function create_Page_Categories_taxonomy() {
	$labels = array(
		'name' => _x( 'Page Categories', 'taxonomy general name' ),
		'singular_name' => _x( 'Page Category', 'taxonomy singular name' ),
		'search_items' =>  __( 'Search Page Categories' ),
		'all_items' => __( 'All Page Categories' ),
		'parent_item' => __( 'Parent Page Category' ),
		'parent_item_colon' => __( 'Parent Page Category:' ),
		'edit_item' => __( 'Edit Page Category' ),
		'update_item' => __( 'Update Page Category' ),
		'add_new_item' => __( 'Add New Page Category' ),
		'new_item_name' => __( 'New Page Categories Name' ),
		'menu_name' => __( 'Page Categories' ),
	);
	register_taxonomy('page_categories',array('page'), array(
		'hierarchical' => true,
		'labels' => $labels,
		'show_ui' => true,
		'show_admin_column' => true,
		'query_var' => true,
		'rewrite' => array( 'slug' => 'page_categories' ),
		'show_in_rest' => true,
	));
}
add_action( 'init', 'create_Page_Categories_taxonomy', 0 );