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(PECL zmq >= 0.5.0)
ZMQSocket::getSockOpt — Get socket option
$key 
   )Returns the value of a socket option.
key 
       An integer representing the option.
       See the  ZMQ::SOCKOPT_*  constants.
      
   Returns either a  string  or an  integer  depending on key. Throws
   ZMQSocketException on error.