Google map integration with CI

And here is the most simple example I can have, a helper function that simply shows a map, without further interaction:

Code:

/**
     * @author Ivan Tcholakov <[email protected]>, 2015
     * @license The MIT License, http://opensource.org/licenses/MIT
     */
    function gmap($latitude, $longitude, $zoom = null, $element_id = null) {

        $latitude = (string) $latitude;
        $longitude = (string) $longitude;

        if ($latitude == '' || $longitude == '') {
            return;
        }

        $zoom = (int) $zoom;

        if ($zoom <= 0) {
            $zoom = 6;
        }

        $element_id = (string) $element_id;

        if ($element_id == '') {
            $element_id = 'map_canvas';
        }

        $prefix = $element_id.'_';

        ob_start();

?><div id="<?php echo $element_id; ?>" class="google-maps"></div>

<script type="text/javascript">
//<![CDATA[

if (typeof google == 'undefined' || typeof google.maps == 'undefined' ) {
    document.write('<script type="text/javascript" src="<?php echo is_https() ? 'https:' : 'http:'; ?>//maps.google.com/maps/api/js?sensor=false">\x3C/script>');
}

$(function () {

    var <?php echo $prefix; ?>latitude = <?php echo json_encode($latitude); ?>;
    var <?php echo $prefix; ?>longitude = <?php echo json_encode($longitude); ?>;
    var <?php echo $prefix; ?>zoom = <?php echo json_encode($zoom); ?>;

    var <?php echo $prefix; ?>position = new google.maps.LatLng(<?php echo $prefix; ?>latitude, <?php echo $prefix; ?>longitude);

    var <?php echo $prefix; ?>options = {
         center: <?php echo $prefix; ?>position,
         zoom: <?php echo $prefix; ?>zoom,
         mapTypeId: google.maps.MapTypeId.ROADMAP
     };

     var <?php echo $prefix; ?>map = new google.maps.Map(document.getElementById('<?php echo $element_id; ?>'), <?php echo $prefix; ?>options);
     var <?php echo $prefix; ?>map_marker = new google.maps.Marker({map: <?php echo $prefix; ?>map, position: <?php echo $prefix; ?>position});
});

//]]>
</script>

<?php

        $result = ob_get_contents();
        ob_end_clean();

        return $result;
    }