The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
YPERR_ACCESS 
    (integer)
   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)