WordPress Gallery based on Zurb Foundation Orbit Carousel

orbit-wp-gallery.php

<?php
/**
Overwrite WordPress Gallery with Zurb Foundation Orbit Carousel
http://foundation.zurb.com/sites/docs/orbit.html
*/

add_filter( 'post_gallery', 'my_custom_foundation_gallery', 10, 2 );

function my_custom_foundation_gallery( $output, $attr ) {

    global $post;

    if ( isset( $attr["orderby"] ) ) {
        $attr[ "orderby" ] = sanitize_sql_orderby($attr[ "orderby" ]);
        if ( !$attr[ "orderby" ] )
            unset( $attr[ "orderby" ] );
    }

    extract( shortcode_atts( array(
        'order' => 'ASC',
        'orderby' => 'menu_order ID',
        'id' => $post->ID,
        'itemtag' => 'dl',
        'icontag' => 'dt',
        'captiontag' => 'dd',
        'columns' => 3,
        'size' => 'thumbnail',
        'include' => '',
        'exclude' => ''
    ), $attr) );

    $id = intval( $id );
    
    if ( 'RAND' == $order ) $orderby = 'none';

    if ( !empty( $include ) ) {
        $include = preg_replace( '/[^0-9,]+/', '', $include );
        $_attachments = get_posts( array( 'include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby ) );

        $attachments = array();
        foreach ( $_attachments as $key => $val ) {
            $attachments[ $val->ID ] = $_attachments[ $key ];
        }
    }

    if ( empty( $attachments ) ) return '';

    // Here's your actual output, you may customize it to your need
    $output = "<div class=\"orbit\" role=\"region\" aria-label=\"Favorite Space Pictures\" data-orbit>\n";
    $output .= "<ul class=\"orbit-container\">\n";

    $output .= "<button class=\"orbit-previous\"><span class=\"show-for-sr\">Previous Slide</span>&#9664;&#xFE0E;</button>";
    $output .= "<button class=\"orbit-next\"><span class=\"show-for-sr\">Next Slide</span>&#9654;&#xFE0E;</button>";

    // Now you loop through each attachment
    $x = 1;

    foreach ( $attachments as $id => $attachment ) {
        // Fetch all data related to attachment 
        $img = wp_prepare_attachment_for_js($id);

        // If you want a different size change 'large' to eg. 'medium'
        $url = $img[ "sizes" ][ "large" ][ "url" ];
        $height = $img[ "sizes" ][ "large" ][ "height" ];
        $width = $img[ "sizes" ][ "large" ][ "width" ];
        $alt = $img[ "alt" ];

        // Store the caption
        $caption = $img[ "caption" ];

        $output .= "<li class=\"orbit-slide\">\n";
        
        $output .= "<img src=\"{$url}\" width=\"{$width}\" height=\"{$height}\" alt=\"{$alt}\" />\n";

        // Output the caption if it exists
        if ($caption) { 
           $output .= "<figcaption class=\"orbit-caption\">{$caption}</figcaption>\n";
        }
        $output .= "</li>\n";

        $x++;
    }

    $output .= "</ul>\n";
    $output .= "</div>\n";

    return $output;

}