(PHP 3 >= 3.0.7, PHP 4, PHP 5 <= 5.0.4)
yp_order() returns the order number for a map or FALSE.
例子 1. Example for the NIS order
<?php $number = yp_order($domain, $mapname); echo "Order number for this map is: " . $number;?>
See also yp_get_default_domain().