(PECL event >= 1.5.0)
EventUtil is a singleton with supplimentary methods and constants.
EventUtil::AF_INET
     IPv4 address family
EventUtil::AF_INET6
     IPv6 address family
EventUtil::AF_UNSPEC
     Unspecified IP address family
EventUtil::SO_DEBUG
     
       Socket option. Enable socket debugging. Only allowed for processes with
       the
       CAP_NET_ADMIN
       capability or an effective user ID of
       0
       . (Added in event-1.6.0.)
      
EventUtil::SO_REUSEADDR
     Socket option. Indicates that the rules used in validating addresses supplied in a bind(2) call should allow reuse of local addresses. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_KEEPALIVE
     Socket option. Enable sending of keep-alive messages on connection-oriented sockets. Expects an integer boolean flag. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_DONTROUTE
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_LINGER
     Socket option. When enabled, a close(2) or shutdown(2) will not return until all queued messages for the socket have been successfully sent or the linger timeout has been reached. Otherwise, the call returns immediately and the closing is done in the background. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_BROADCAST
     Socket option. Reports whether transmission of broadcast messages is supported. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_OOBINLINE
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_SNDBUF
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_RCVBUF
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_SNDLOWAT
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_RCVLOWAT
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_SNDTIMEO
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_RCVTIMEO
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_TYPE
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SO_ERROR
     Socket option. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SOL_SOCKET
     Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SOL_TCP
     Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::SOL_UDP
     Socket option level. See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::IPPROTO_IP
     See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::IPPROTO_IPV6
     See the socket(7) manual page. (Added in event-1.6.0.)
EventUtil::LIBEVENT_VERSION_NUMBER
     Libevent' version number at the time when Event extension had been compiled with the library.