LXXVIII. 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_get_default_domain — Fetches the machine's 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 matched 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.