title: Socket.io send disconnect event with parameter
body: <p>I want to send disconnect event manually with custom parameter to socket.io server. I use this function but won't work:</p>
  
  <p>//client</p>
  
  <pre><code>var userId = 23;
  socket.disconnect(user);
  </code></pre>
  
  <p>//Server</p>
  
  <pre><code>socket.on('disconnect', function (data) {
          console.log('DISCONNECT: '+  data)
      })
  </code></pre>
  
  <p>Now how can I send a additional data to server when disconnect event sent?</p>