Google Maps shortcode

<?php
/*
Plugin Name: Google Maps shortcode
Plugin URI: http://www.damiencarbery.com
Description: Shortcode for Google map.
Author: Damien Carbery
Version: 0.1

$Id: map_shortcode.php 2309 2014-01-27 08:31:57Z damien $

Usage:
[dc_map zoom="15" location="53.302343, -6.177633" height="300" marker="yes" marker_title="This does not appear"]


*/

add_action('wp_head', 'add_google_maps');
function add_google_maps() {
?>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<?php
}
    /** Map
      *
      * Creates and inserts a Google Maps map into the content.
      *
      * @param array $atts The attributes passed to the shortcode
      * @param string $content The content the shortcode is wrapped around
      *
      *
      * @uses prepare_margin()
      *
      * @return string $output The resulting HTML code
      *
      */
function dc_shortcode_map( $atts, $content ) {

        // Extract the attributes into variables
        $atts = shortcode_atts( array(
            'sample'    => false,
            //'margin' => $this->shortcodes['map']['margin'],
            'location' => '',
            'zoom' => 12,
            'maptype' => 'ROADMAP',
            'marker' => 'no',
            'marker_title' => '',
            'height' => 100,
            'style' => '',
         ), $atts );

        extract( $atts );

        // Prepare the style and class display and the output
        $style_array = array(); $class_array = array(); $output = '';

        // Create Output
        $style_array['height'] = 'height: ' . $height . 'px';
        //$style_array['margin'] = 'margin: ' . $this->prepare_margin( $margin );
        $style_string = implode( '; ', $style_array ) ;
        $style_string .= '; ' . $style;

        $location_request = 'http://maps.googleapis.com/maps/api/geocode/json?address=' . urlencode( $location ) . '&sensor=false';
        $location_info = json_decode( file_get_contents( $location_request ) );
        $geocode = $location_info->results[0]->geometry->location;

        $id = rand(12345,99999);
        $output .='
        <script>
                var coordinates_' . $id . ' = new google.maps.LatLng(' . $geocode->lat . ', ' . $geocode->lng . ');
                var mapOptions_' . $id . ' = {
                    zoom: ' . $zoom . ',
                    center: coordinates_' . $id . ',
                    mapTypeId: google.maps.MapTypeId.' . strtoupper( $maptype ) . '
                }
        ';
        if( $marker == "yes" ) {
            $output .= '
                var marker_' . $id . ' = new google.maps.Marker({
                    position: coordinates_' . $id . ',
                    title:"'.$marker_title.'"
                });
            ';
        }

        $output .= '

                jQuery(window).load( function() {
                    map_' . $id . ' = new google.maps.Map(document.getElementById("map-'.$id.'"), mapOptions_' . $id . ')
                    if( typeof marker_' . $id . ' != "undefined" && marker_' . $id . ' != "" ) {
                        marker_' . $id . '.setMap(map_' . $id . ');
                    }
                })
        ';

        $output .= '
        </script>
        ';

        $output .= '<div class="map">';
        $output .= '<div class="map_canvas googlemap" style="' . $style_string . '" id="map-'.$id.'"></div>';
        $output .= '</div>';

        return $output;
    }
add_shortcode( 'dc_map', 'dc_shortcode_map' );
?>