Build a link to Bing Map (for WordPress Theme)

bing-map-link.php

<?php
/**
 * Build a link to Bing Maps
 *
 * @since 1.0
 *
 * @param string $lat the requested Latitude of the location. Required, default is empty.
 * @param string $lng the requested Longitude of the location. Required, default is empty.
 * @return mixed The url if successful. Empty otherwise.
 */
function _get_bing_url( $lat = '', $lng = '' ){

    if( !$lat || !$lng ){
        return '';
    }

    $url = add_query_arg(
        array(
            'cp' => $lat . '~' . $lng,
            'lvl' => '17',
            'style' => 'a'
            ),
        '//bing.com/maps/default.aspx'
    );

    return $url;
}