Refer Phaser Group that allows for depth sorting and multiple groups

ReferGroup.js

/**
* 
* Example
* object_group = Playground.game.add.group(game.world, "group_all");
* order_item = new ReferGroup("item", object_group);
* order_hero = new ReferGroup("hero", object_group);
* 
* // add sprite
* order_hero.add(sprite);
* // sort
* object_group.sort('y', Phaser.Group.SORT_ASCENDING);
*/

ReferGroup = {};

ReferGroup = function(name, parentGroup) {
  this.name = name;
  this.parentGroup = parentGroup;
  this.children = [];
};

ReferGroup.prototype.name = "";
ReferGroup.prototype.parentGroup = null;
ReferGroup.prototype.children = [];

ReferGroup.prototype.add = function(sprite) {
  this.parentGroup.add(sprite);
  this.children.push(sprite);
};

ReferGroup.prototype.addChild = function(sprite) {
  this.add(sprite);
};

ReferGroup.prototype.removeChildren = function() {
  for (var i = this.children.length; i > 0; i--) {
    sprite = this.children.pop();
    sprite.kill();
  }  
  this.children = [];
};

ReferGroup.prototype.removeAll = function() {
  this.removeChildren();
};

ReferGroup.prototype.removeChildAt = function(index) {
  sprite = this.children.splice(index, 1)[0];
  sprite.kill();
};

ReferGroup.prototype.alpha = function(alpha_n) {
  for (var i = 0; i < this.children.length; i++) {
    this.children[i].alpha(alpha_n);
  }
};

ReferGroup.prototype.bringToTop = function() {
  for (var i = 0; i < this.children.length; i++) {
    this.parentGroup.bringToTop(this.children[i]);
  }  
}