apply_filters( ‘the_category_list’, WP_Term[] $categories, int|false $post_id )

Filters the categories before building the category list.

Parameters

$categoriesWP_Term[]: An array of the post’s categories.
$post_idint|false: ID of the post to retrieve categories for.
When false, defaults to the current post in the loop.

$categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id );

Used by	Description
get_the_category_list()`wp-includes/category-template.php`	Retrieves category list for a post in either HTML list or custom format.

Version	Description
4.4.0	Introduced.

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