Method getProductIdBySku

public static function getProductIdBySku($sku, $typeSku = 'sku', $type = array(0, 1))
{
    $db = Factory::getDBO();
    $sku = $db->quote($sku);
    $typeSkuS = $db->quoteName('a.' . $typeSku);
    $typeSkuSA = $db->quoteName('ps.' . $typeSku);
    $wheres = array();
    // standard product
    $wheresA = array();
    // advanced stock management product (EAN, SKU)
    $user = PhocacartUser::getUser();
    $userLevels = implode(',', $user->getAuthorisedViewLevels());
    $userGroups = implode(',', PhocacartGroup::getGroupsById($user->id, 1, 1));
    $wheres[] = " a.access IN (" . $userLevels . ")";
    $wheres[] = " c.access IN (" . $userLevels . ")";
    $wheres[] = " (ga.group_id IN (" . $userGroups . ") OR ga.group_id IS NULL)";
    $wheres[] = " (gc.group_id IN (" . $userGroups . ") OR gc.group_id IS NULL)";
    $wheres[] = " a.published = 1";
    $wheres[] = " c.published = 1";
    //$wheres[] 	= ' c.type IN ('.implode(',', $type).')';
    if (!empty($type) && is_array($type)) {
        $wheres[] = ' c.type IN (' . implode(',', $type) . ')';
    }
    $wheresA = $wheres;
    $wheres[] = ' ' . $typeSkuS . ' = ' . $sku;
    $wheresA[] = ' ' . $typeSkuSA . ' = ' . $sku;
    $query = ' SELECT a.id, c.id as catid' . ' FROM #__phocacart_products AS a' . ' LEFT JOIN #__phocacart_product_categories AS pc ON pc.product_id = a.id' . ' LEFT JOIN #__phocacart_categories AS c ON c.id = pc.category_id' . ' LEFT JOIN #__phocacart_item_groups AS ga ON a.id = ga.item_id AND ga.type = 3' . ' LEFT JOIN #__phocacart_item_groups AS gc ON c.id = gc.item_id AND gc.type = 2' . ' WHERE ' . implode(' AND ', $wheres) . ' ORDER BY a.id';
    //.' LIMIT 1';
    $db->setQuery($query);
    $products = $db->loadObjectlist();
    // We didn' find SKU or EAN in standard products
    // Then try to find it in Advanced Stock Management (only SKU and EAN are active)
    // POS
    if (empty($products) && ($typeSku == 'sku' || $typeSku == 'ean')) {
        // Try to find SKU or EAN in Advanced stock management
        $query = ' SELECT a.id, c.id AS catid, ps.attributes AS attributes' . ' FROM #__phocacart_products AS a' . ' LEFT JOIN #__phocacart_product_categories AS pc ON pc.product_id = a.id' . ' LEFT JOIN #__phocacart_categories AS c ON c.id = pc.category_id' . ' LEFT JOIN #__phocacart_product_stock AS ps ON a.id = ps.product_id' . ' LEFT JOIN #__phocacart_item_groups AS ga ON a.id = ga.item_id AND ga.type = 3' . ' LEFT JOIN #__phocacart_item_groups AS gc ON c.id = gc.item_id AND gc.type = 2' . ' WHERE ' . implode(' AND ', $wheresA) . ' ORDER BY a.id';
        //.' LIMIT 1';
        $db->setQuery($query);
        $products = $db->loadObjectlist();
    }
    if (!empty($products)) {
        foreach ($products as $k => $v) {
            if (isset($v->id) && (int) $v->id > 0 && isset($v->catid) && (int) $v->catid > 0) {
                $access = PhocacartProduct::checkIfAccessPossible((int) $v->id, (int) $v->catid, $type);
                if ($access) {
                    // if found some return the first possible - accessible
                    // because of different rights, groups, etc., we need to know catid
                    $product = array();
                    $product['id'] = (int) $v->id;
                    $product['catid'] = (int) $v->catid;
                    if (isset($v->attributes) && $v->attributes != '') {
                        $product['attributes'] = unserialize($v->attributes);
                    }
                    return $product;
                }
            }
        }
    }
    return false;
}