castopod/app/Helpers/url_helper.php

<?php

if (!function_exists('host_url')) {
    /**
     * Return the host URL to use in views
     *
     * @return string|false
     */
    function host_url()
    {
        if (isset($_SERVER['HTTP_HOST'])) {
            $protocol =
                (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ||
                $_SERVER['SERVER_PORT'] == 443
                    ? 'https://'
                    : 'http://';
            return $protocol . $_SERVER['HTTP_HOST'] . '/';
        }

        return false;
    }
}

if (!function_exists('current_season_url')) {
    /**
     * Return the podcast URL with season number to use in views
     *
     * @return string
     */
    function current_season_url()
    {
        $season_query_string = '';
        if (isset($_GET['season'])) {
            $season_query_string = '?season=' . $_GET['season'];
        } elseif (isset($_GET['year'])) {
            $season_query_string = '?year=' . $_GET['year'];
        }
        return current_url() . $season_query_string;
    }
}

if (!function_exists('location_url')) {
    /**
     * Returns URL to display from location info
     *
     * @param string $locationName
     * @param string $locationGeo
     * @param string $locationOsmid
     *
     * @return string
     */
    function location_url($locationName, $locationGeo, $locationOsmid)
    {
        $uri = '';

        if (!empty($locationOsmid)) {
            $uri =
                'https://www.openstreetmap.org/' .
                ['N' => 'node', 'W' => 'way', 'R' => 'relation'][
                    substr($locationOsmid, 0, 1)
                ] .
                '/' .
                substr($locationOsmid, 1);
        } elseif (!empty($locationGeo)) {
            $uri =
                'https://www.openstreetmap.org/#map=17/' .
                str_replace(',', '/', substr($locationGeo, 4));
        } elseif (!empty($locationName)) {
            $uri =
                'https://www.openstreetmap.org/search?query=' .
                urlencode($locationName);
        }

        return $uri;
    }
}