public function set_table_names($tables = false)
{
if (!is_array($tables)) {
$tables = array();
}
if (!isset($tables['cart'])) {
$tables['cart'] = 'cart';
}
if (!isset($tables['cart_orders'])) {
$tables['cart_orders'] = 'cart_orders';
}
if (!isset($tables['cart_shipping'])) {
$tables['cart_shipping'] = 'cart_shipping';
}
if (!isset($tables['cart_taxes'])) {
$tables['cart_taxes'] = 'cart_taxes';
}
$this->tables = $tables;
}