How does multiplayer phaser work?

[matthewvcortese]

So I haven't looked at the code at all, but I'm just wondering how you got Phaser to work securely for multiplayer.

Since Phaser controls physics/location on the client-side, isn't it possible for someone to hack their client to run fast or teleport in the game?

[Substractive]

Yes it is possible if the logic is on client side. You should have logic implemented on server side and client only sends and receives data.
Example of looting:
Player (Client) killed creature and opens up loot window. Client sends data to server which creature was killed, where and it's level or any other data. Then server checks if that is true , is that creature really at that position and that level or any other data needed and then server sends loot data and maybe experience to client and that's how you can know for sure that player killed that creature on right spot and give him right loot not one he hacked.