Filters a taxonomy drop-down display element.

A variety of taxonomy drop-down display elements can be modified just prior to display via this filter. Filterable arguments include ‘show_option_none’, ‘show_option_all’, and various forms of the term name.

• wp_dropdown_categories()

$element string

Category name.

$category WP_Term|null

The category object, or null if there's no corresponding category.

File: wp-includes/category-template.php. View all references

$show_option_none = apply_filters( 'list_cats', $parsed_args['show_option_none'], null );