available_permalink_structure_tags filter-hook . WP 4.8.0

Filters the list of available permalink structure tags on the Permalinks settings page.

Usage

add_filter( 'available_permalink_structure_tags', 'filter_function_name_4972' );
function filter_function_name_4972( $available_tags ){
	// filter...

	return $available_tags;
}

$available_tags(array)

A key => value pair of available permalink structure tags.

Where the hook is called

$available_tags = apply_filters( 'available_permalink_structure_tags', $available_tags );

Where the hook is used (in WP core)