(PHP 4, PHP 5 <= 5.0.5)
yp_match — Returns the matched line
$domain
   , string $map
   , string $key
   )
   Returns the value associated with the passed key
   out of the specified map. 
  
domain
     The NIS domain name.
map
     The NIS map.
key
     This key must be exact.
   Returns the value, or FALSE on errors.
  
Example #1 Example for NIS match
<?php
$entry = yp_match($domain, "passwd.byname", "joe");
echo "Matched entry is: " . $entry;
?>
The above example will output something similar to:
joe:##joe:11111:100:Joe User:/home/j/joe:/usr/local/bin/bash