WordPress at a glance
filter is not described

author_link filter-hook . WP 2.1.0

Filters the URL to the author's page.

Usage

add_filter( 'author_link', 'filter_function_name_2981', 10, 3 );
function filter_function_name_2981( $link, $author_id, $author_nicename ){
	// filter...

	return $link;
}
$link(string)
The URL to the author's page.
$author_id(int)
The author's id.
$author_nicename(string)
The author's nice name.

Where the hook is called

get_author_posts_url()
wp-includes/author-template.php 361
$link = apply_filters( 'author_link', $link, $author_id, $author_nicename );

Where the hook is used (in WP core)

Does not used.