init() init is the very first function called when your State starts up. It's called before preload, create or anything else.If

new StateManager(game, pendingState) The State Manager is responsible for loading, setting up and switching

physics : Phaser.Physics A reference to the physics

onCreateCallback : Function This is called when the state preload has finished and creation begins.

shutdown() This method will be called when the State is shutdown (i.e. you switch to another state from this one).

stage : Phaser.Stage A reference to the Stage.

onPausedCallback : Function This is called when the game is paused. Source

onPreloadCallback : Function This is called when the state starts to load assets. Source

loadUpdate() loadUpdate is called during the Loader process. This only happens if you've set one or more assets to load in the preload

input : Phaser.Input A reference to the Input Manager