yp_first
    (PHP 3>= 3.0.7, PHP 4 , PHP 5)
yp_first -- 
     Returns the first key-value pair from the named map
    
Description
array 
yp_first ( string domain, string map)
     yp_first() returns the first key-value
     pair from the named map in the named domain, otherwise FALSE.
    
     
Example 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; ?>
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     See also yp_next() and
     yp_get_default_domain().