Devristo

<?php

class Node
{
    public $childs = [];

    public function __serialize()
    {
        return [$this->childs];
    }

Devristo

ko.bindingHandlers.select2 = {
    init: function (element, valueAccessor, allBindingsAccessor) {
        var obj = valueAccessor(),
            allBindings = allBindingsAccessor(),
            lookupKey = allBindings.lookupKey;
        var select2 = $(element).select2(obj);

        // Bind events
        if ("on" in obj) {
            for (var event in obj.on) {