PhaserJS collision tilemap not working - json

Question

I have a tilemap that only 1 layer is correctly colliding with the player. Been through all the examples, but i can't seem to get it working on multiple layers.
I have 1 tilemap that contains all the json data for a total of 13 layers, but for the example i have only included 3.
I would like for the player to collide with different layers and have different callbacks, e.g. cannot walk through, pick up item if within range etc. but all using 1 spritemap/tilemap.
var game = new Phaser.Game(1200, 780, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, update: update, render: render });
function preload() {
this.load.tilemap('main_map', 'img here', null, Phaser.Tilemap.TILED_JSON);
this.load.image('sprite_map', 'img here');
this.load.image('player_image', 'img here');
}
var map;
var tileset;
var bLayer;
var wLayer;
var player;
var sLayer;
var cursors;
function create() {
game.physics.startSystem(Phaser.Physics.ARCADE);
// initiallize the tilemap
map = game.add.tilemap('main_map');
map.addTilesetImage('otherNew', 'sprite_map');
//draw the layers
bLayer = map.createLayer(0);
wLayer = map.createLayer(1);
sLayer = map.createLayer(2);
wLayer.resizeWorld();
player = game.add.sprite(600, 600, 'player_image');
game.physics.arcade.enable(player);
player.body.collideWorldBounds = true; // works
//game camera and movment keys here
}
function update() {
game.physics.arcade.collide(player, wLayer); // DOES NOT WORK
game.physics.arcade.collide(player, sLayer); // THIS WORKS
map.setCollision(1, true, wLayer); // DOES NOT WORK
map.setCollision(2, true, sLayer); // THIS WORKS
//movement here already works so didn't include
}

Answer 1

I'm thinking that your wLayer.resizeWorld(); function makes your tilemap's width/height the size of the world. Looks like this is the only difference between wLayer and sLayer.
Setting width/height in Phaser does not automatically resize the collision body. To do that, use the setSize function.
To view your current body, use Phaser's debug methods
this.game.debug.body(someSprite, 'rgba(255,0,0,0.5)');

Answer 2

The answer is that each layer has its own set of tilemaps, and as i was using a spritesheet to generate each layer, those layers had some value that needed to be set. I didn't have the patience to check what actual collision layer I needed, but as I had split them all up into separate logical layers I just set between 0, 100 for each.
// In the create section
map.setCollisionBetween(0, 100,true, wLayer,true);
map.setCollisionBetween(0, 100,true, sLayer,true);