functions.php

<?php

/**
 *** Enter here the ID of the products category ***
 *
 */
$category_id = 3;

/**
 * URL segments array after catalog www.my-site.com/catalog/(segment-1/segment-2/etc...)
 */
$urlSegments = getUrlSegments();

/**
 * Shorten config
 */
$config = $catalog->processor->config;

/**
 * GS page slug
 */
$slug = get_page_slug(false);

/**
 * Declare some vars
 *
 * @route       - Current catalog route
 * @items       - Item array (List view)
 * @currentItem - Current item object (Item details view)
 * @category    - Current category object
 * @msg         - Error/Notice message
 */
$route = array();
$items = array();
$currentItem = null;
$category = null;
$msg = null;

/**
 * Get the catalog route
 */
if($catalog->router->isRouteExists($urlSegments[0])) {
    $route = $catalog->router->getRoute($urlSegments[0]);
}

/**
 * Get the current item object
 */
if(!empty($route['id'])) {
    $currentItem = $catalog->processor->getItem($route['categoryid'], $route['id']);
}

/**
 * Check if the categy exists, select it
 */
$category = $catalog->processor->getItem(
    $config->dummyCategoryId, $category_id
);

// Item details page data
if(isset($currentItem->id))
{
    // Create thumbnail if it does not exist yet
    $currentItem->thumbnail = \ImCatalog\Util::getResizedUrl($currentItem, 0, 700, 0, 'resize');
    // Build our tags output
    $tags = array_map('trim', explode(',', $currentItem->tags));
    // Override the default tags variable
    $currentItem->tags = '';
    foreach($tags as $tag) {
        $currentItem->tags .= ($tag) ?
            '<span class="tag"><a href="'.$config->startPageUri.'tags/'.strtolower($tag).'/">'.$tag.'</a></span>' : '';
    }

// Item list page data
} elseif($slug == $config->catalogStartPage)
{
    // Intercept the tags input
    $tag_selector = '';
    $pager_prefix = '';
    if($urlSegments[0] == 'tags' && isset($urlSegments[1]))
    {
        $tag_selector = '&&tags=%' . $catalog->imanager->sanitizer->text($urlSegments[1]) . '%';
        $pager_prefix = $urlSegments[0] . '/' . $urlSegments[1] . '/';
    }

    if(!empty($category->id))
    {

        $params = array(
            'section' => 'frontend',
            'selector' => 'active=1'.$tag_selector,
            'pageurl' => $config->startPageUri.$pager_prefix.'page',
            'perpage' => 3,
            'tagurl' => (isset($_GET['tags']) ? $catalog->imanager->sanitizer->text($_GET['tags']) : '')
        );

        $result = $catalog->processor->getItems($category->id, $params);

    } else
    {
        $msg = '<div class="alert alert-danger">' .
            '<strong>Attention!</strong> The category ID "'.(int)$category_id.'" you entered does not exist yet.' .
            '</div>';
    }

    $pagination = '';
    if(!empty($result['items']))
    {
        $items = itemsPrepare($result['items']);
        $pagination = ($result['pagination']) ?
            '<div class="container bts-24 pull-left">'.$result['pagination'].'</div>' : '';
    }
}

/**
 * Prepare the SimpleItem objects for output
 *
 * @param array $items - An array with SimpleItem objects
 *
 * @return array - Prepared array with SimpleItem objects
 */
function itemsPrepare($items = array())
{
    global $catalog;
    foreach($items as $item)
    {
        // Create thumbnail if it does not exist yet
        $item->thumbnail = \ImCatalog\Util::getResizedUrl($item, 0, 0, 360, 'resize');
        // Build our tags output
        $tags = array_map('trim', explode(',', $item->tags));
        // Override the default tags variable
        $item->tags = '';
        foreach($tags as $tag) {
            $item->tags .= ($tag) ?
                '<span class="tag"><a href="'.
                    $catalog->processor->config->startPageUri.'tags/'.strtolower($tag).'/">'.$tag.'</a></span>' : '';
        }
    }
    return $items;
}

/**
 * It's an URL segmentation function
 *
 * Separates a segment part of the URL: "www.my-site.com/catalog/(segment)" by slashes, for instance:
 * "www.my-site.com/catalog/tags/clothing/" becomes "array(0 => 'tags', 1 => 'clothing')"
 *
 *
 * @return array|null - URL segments
 *
 */
function getUrlSegments()
{
    if(!isset($_GET['seg'])) return null;
    global $catalog;
    return explode('/', $catalog->imanager->sanitizer->text(trim($_GET['seg'], '/')));
}