WordPress at a glance
filter is not described

search_link filter-hook . WP 3.0.0

Filters the search permalink.

Usage

add_filter( 'search_link', 'filter_function_name_111', 10, 2 );
function filter_function_name_111( $link, $search ){
	// filter...

	return $link;
}
$link(string)
Search permalink.
$search(string)
The URL-encoded search term.

Where the hook is called

get_search_link()
wp-includes/link-template.php 1051
return apply_filters( 'search_link', $link, $search );

Where the hook is used (in WP core)

Does not used.