February 12, 2011 
Definition:
function wp_update_link( $linkdata ) {}
Update a link in the database.
Parameters
- array $linkdata: Link data to update.
Return values
returns:Value 0 or WP_Error on failure. The updated link ID on success.
Source code
function wp_update_link( $linkdata ) {
$link_id = (int) $linkdata['link_id'];
$link = get_bookmark( $link_id, ARRAY_A );
// Escape data pulled from DB.
$link = add_magic_quotes( $link );
// Passed link category list overwrites existing category list if not empty.
if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
&& 0 != count( $linkdata['link_category'] ) )
$link_cats = $linkdata['link_category'];
else
$link_cats = $link['link_category'];
// Merge old and new fields with new fields overwriting old ones.
$linkdata = array_merge( $link, $linkdata );
$linkdata['link_category'] = $link_cats;
return wp_insert_link( $linkdata );
}
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