(PECL event >= 1.2.6-beta)
EventDnsBase::setOption — Set the value of a configuration option
$option
   , 
    string
     $value
   ): boolSet the value of a configuration option.
option
    
      The currently available configuration options are:
      "ndots"
      ,
      "timeout"
      ,
      "max-timeouts"
      ,
      "max-inflight"
      , and
      "attempts"
      .
     
value
    Option value.
   成功时返回 true, 或者在失败时返回 false。