more specifically, you can find the pecl extension here:
http://pecl.php.net/package/yp
Only the download though. As of posting no documentation lives there.
CLXXVIII. YP/NIS Functions
Introdução
NIS (formerly called Yellow Pages) allows network management of important administrative files (e.g. the password file). For more information refer to the NIS manpage and The Linux NIS(YP)/NYS/NIS+ HOWTO. There is also a book called Managing NFS and NIS by Hal Stern.
Nota: This extension has been moved to the PECL repository and is no longer bundled with PHP as of PHP 5.1.0.
Nota: Esta extensão não está disponível na plataforma Windows.
Dependências
None besides functions from standard Unix libraries which are always available (either libc or libnsl, configure will detect which one to use).
Instalação
To get these functions to work, you have to configure PHP with --enable-yp.
Configurações em execução
Esta extensão não define nenhum parâmetro de configuração no php.ini.
Constantes pré-definidas
As contantes abaixo são definidas por esta extensão e somente estarão disponíveis quando a extensão foi compilada com o PHP ou carregada dinamicamente durante a execução.
- YPERR_BADARGS (integer)
- YPERR_BADDB (integer)
- YPERR_BUSY (integer)
- YPERR_DOMAIN (integer)
- YPERR_KEY (integer)
- YPERR_MAP (integer)
- YPERR_NODOM (integer)
- YPERR_NOMORE (integer)
- YPERR_PMAP (integer)
- YPERR_RESRC (integer)
- YPERR_RPC (integer)
- YPERR_YPBIND (integer)
- YPERR_YPERR (integer)
- YPERR_YPSERV (integer)
- YPERR_VERS (integer)
- Índice
- yp_all -- Traverse the map and call a function on each entry
- yp_cat -- Return an array containing the entire map
- yp_err_string -- Returns the error string associated with the given error code
- yp_errno -- Returns the error code of the previous operation
- yp_first -- Returns the first key-value pair from the named map
- yp_get_default_domain -- Fetches the machine's default NIS domain
- yp_master -- Returns the machine name of the master NIS server for a map
- yp_match -- Returns the matched line
- yp_next -- Returns the next key-value pair in the named map
- yp_order -- Returns the order number for a map
