(PECL zmq >= 1.0.4)
ZMQContext::setOpt — Set a socket option
   Sets a ZMQ context option. The type of the value depends on the key.
   See ZMQ Constant Types for more information.
  
key
       One of the ZMQ::CTXOPT_* constants.
      
valueThe value of the parameter.
Returns the current object. Throws ZMQContextException on error.