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(PHP 4, PHP 5 <= 5.0.5)
yp_get_default_domain — Fetches the machine's default NIS domain
Returns the default domain of the node. Can be used as the domain parameter for successive NIS calls.
A NIS domain can be described a group of NIS maps. Every host that needs to look up information binds itself to a certain domain. Refer to the documents mentioned at the beginning for more detailed information.
   Returns the default domain of the node or  FALSE . Can be used as the
   domain parameter for successive NIS calls.
  
Example #1 Example for the default domain
  <?php
$domain  =  yp_get_default_domain ();
echo  "Default NIS domain is: "  .  $domain ;
 ?>