category_css_class – Hook | Developer.WordPress.org

apply_filters( ‘category_css_class’, string[] $css_classes, WP_Term $category, int $depth, array $args )

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

Description

$css_classesstring[]: An array of CSS classes to be applied to each list item.
$categoryWP_Term: Category data object.
$depthint: Depth of page, used for padding.
$argsarray: 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.

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

Used by	Description
Walker_Category::start_el()`wp-includes/class-walker-category.php`	Starts the element output.

Version	Description
4.2.0	Introduced.

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