XXXV. NIS Functions
    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     Introduction to YP/NIS. There is also a book called Managing
    NFS and NIS by Hal Stern.
   
    To get these functions to work, you have to configure PHP with
    --with-yp.
  
- Table of Contents
- yp_get_default_domain — Fetches the machines default NIS domain.
- yp_order — Returns the order number for a map.
- yp_master — Returns the machine
     name of the master NIS server for a map.
- yp_match — Returns the mached line
- yp_first —  Returns the first key-value pair from the named
     map.
- yp_next — Returns the next key-value pair in the named
     map.
- yp_errno — Returns the error code of
    the previous operation
- yp_err_string — Returns the error string associated with the previous
    operation.