CVII. YP/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(PHP 3) or
    --enable-yp(PHP 4).
   
- Table of Contents
- 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 previous operation
   
- 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