string yp_master(string domain, string map);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, $mapname);
if(!$number) {
echo yp_errno() . ": " . yp_err_string();
}
echo "Master for this map is: " . $master;
?>
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See also: yp_get_default_domain yp_errno and yp_err_string