Filters the list of CSS classes to include with each category in the list.

• wp_list_categories()

$css_classes string[]

An array of CSS classes to be applied to each list item.

$category WP_Term

Category data object.

$depth int

Depth of page, used for padding.

$args array

An array of wp_list_categories() arguments.

More Arguments from wp_list_categories( ... $args )

Array or string of arguments. See WP_Term_Query::__construct() for information on accepted arguments.

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

$css_classes = implode( ' ', apply_filters( 'category_css_class', $css_classes, $category, $depth, $args ) );