WordPress at a glance
function is not described

get_bookmark_field() WP 2.3.0

Retrieve single bookmark data item or field.

No Hooks.

Return

String/WP_Error.

Usage

get_bookmark_field( $field, $bookmark, $context );
$field(string) (required)
The name of the data field to return
$bookmark(int) (required)
The bookmark ID to get field
$context(string)
The context of how the field will be used.
Default: 'display'

Code of get bookmark field: wp-includes/bookmark.php WP 5.2.2

<?php
function get_bookmark_field( $field, $bookmark, $context = 'display' ) {
	$bookmark = (int) $bookmark;
	$bookmark = get_bookmark( $bookmark );

	if ( is_wp_error( $bookmark ) ) {
		return $bookmark;
	}

	if ( ! is_object( $bookmark ) ) {
		return '';
	}

	if ( ! isset( $bookmark->$field ) ) {
		return '';
	}

	return sanitize_bookmark_field( $field, $bookmark->$field, $bookmark->link_id, $context );
}