This filter is applied within the breadcrumb_navxt_trail class in the maybe_add_post_type_arg() function. This filter was introduced in version 5.4. It receives three parameters:

  • $add_query_arg(boolean)(required) The boolean decision whether or not to add the post type query argument to the URL to filter
  • $type(string)(optional) The name of the post type that is under consideration for addition to the URL
  • $taxonomy(string|NULL)(optional) The taxonomy name for the archive in question (may be null)

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