(PECL event >= 1.2.6-beta)
Represents Libevent's DNS base structure. Used to resolve DNS asyncronously, parse configuration files like resolv.conf etc.
EventDnsBase::OPTION_SEARCH
     
       Tells to read the domain and search fields from the
       resolv.conf
       file and the
       ndots
       option, and use them to decide which domains(if any) to search for
       hostnames that aren’t fully-qualified.
      
EventDnsBase::OPTION_NAMESERVERS
     
       Tells to learn the nameservers from the
       resolv.conf
       file.
      
EventDnsBase::OPTION_MISC
     EventDnsBase::OPTION_HOSTSFILE
     
       Tells to read a list of hosts from
       /etc/hosts
       as part of loading the
       resolv.conf
       file.
      
EventDnsBase::OPTIONS_ALL
     
       Tells to learn as much as it can from the
       resolv.conf
       file.
      
EventDnsBase::DISABLE_WHEN_INACTIVE
     Do not prevent the libevent event loop from exiting when we have no active DNS requests.
EventDnsBase::INITIALIZE_NAMESERVERS
     
       Process the resolv.conf.
      
EventDnsBase::NAMESERVERS_NO_DEFAULT
     
       Do not add default nameserver if there are no nameservers in the resolv.conf.
      
