How to use MouseWheel in the latest version

Hello, I want to update a game, and I would like to use Phaser v2.13.2, but mouse wheel does not work anymore.
I don’t understand how to use it now. Here is my old code:

game.input.mouse.mouseWheelCallback = mouseWheel;

function mouseWheel(event)
    if (game.input.mouse.wheelDelta == 1){
          // console.log("scroll");

OK, I found this example: