int yp_order(string domain, string map);yp_order() returns the order number for a map or FALSE.
| Example 1. Example for the NIS order <?php
    $number = yp_order($domain,$mapname);
    if(!$number) {
        echo yp_errno() . ": " . yp_err_string();
    }
    echo "Order number for this map is: " . $order;
?>
       | 
See also: yp_get_default_domain yp_errno and yp_err_string