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Slider_tax

// Register Custom Taxonomy
function slider_taxonomy() {

	$labels = array(
		'name'                       => 'Slides',
		'singular_name'              => 'Slide',
		'menu_name'                  => 'Slider',
		'all_items'                  => 'All Slides',
		'parent_item'                => 'Slide',
		'parent_item_colon'          => 'Slide',
		'new_item_name'              => 'New Slide',
		'add_new_item'               => 'Add New Slide',
		'edit_item'                  => 'Edit Slide',
		'update_item'                => 'Update Slide',
		'view_item'                  => 'View Slide',
		'separate_items_with_commas' => 'Separate Slides with commas',
		'add_or_remove_items'        => 'Add or Remove Slides',
		'choose_from_most_used'      => 'Choose From Most Used',
		'popular_items'              => 'Popular Slides',
		'search_items'               => 'Search Slides',
		'not_found'                  => 'Not Found',
		'no_terms'                   => 'No Slides',
		'items_list'                 => 'Slides List',
		'items_list_navigation'      => 'Slides List Navigation',
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => false,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
		'show_in_rest'               => true,
		'rest_base'                  => 'slides',
	);
	register_taxonomy( 'slider', array( 'pages', 'posts' ), $args );

}
add_action( 'init', 'slider_taxonomy', 0 );