(PHP 3>= 3.0.7, PHP 4 )
yp_first() returns the first key-value pair from the named map in the named domain, otherwise FALSE.
例子 1. Example for the NIS first
<?php$entry = yp_first($domain, "passwd.byname");$key = key($entry);$value = $entry [$key];echo "First entry in this map has key " . $key . " and value " . $value;?>
See also yp_next() and yp_get_default_domain().