(PHP 3>= 3.0.7, PHP 4 >= 4.0.0)
yp_master() returns the machine name of the master NIS server for a map.
Example 1. Example for the NIS master
<?php $number = yp_master ($domain, $mapname); echo "Master for this map is: " . $master; ?>
See also yp-get-default-domain().