WordPress at a glance
filter is not described

get_pagenum_link filter-hook . WP 2.5.0

Filters the page number link for the current request.

Usage

add_filter( 'get_pagenum_link', 'filter_function_name_5560' );
function filter_function_name_5560( $result ){
	// filter...

	return $result;
}
$result(string)
The page number link.

Where the hook is called

get_pagenum_link()
wp-includes/link-template.php 2145
$result = apply_filters( 'get_pagenum_link', $result );

Where the hook is used (in WP core)

Does not used.