WordPress at a glance
filter is not described

link_category filter-hook . WP 2.2.0

Filters the OPML outline link category name.

Usage

add_filter( 'link_category', 'filter_function_name_2726' );
function filter_function_name_2726( $catname ){
	// filter...

	return $catname;
}
$catname(string)
The OPML outline category name.

Where the hook is called

In file: /wp-links-opml.php
link_category
wp-links-opml.php 58
$catname = apply_filters( 'link_category', $cat->name );
wp-includes/bookmark-template.php 257
$catname = apply_filters( 'link_category', $cat->name );
wp-includes/deprecated.php 1040
echo '  <li id="linkcat-' . $cat->term_id . '" class="linkcat"><h2>' . apply_filters('link_category', $cat->name ) . "</h2>\n\t<ul>\n";

Where the hook is used (in WP core)

Does not used.