JavaScript / PHP: JSON Object to PHP Object

js2phpobj.js

/**
 * Converts a JS object to PHP object  
 **/
function jsObj2phpObj(object){
	var json = '{';
	for(property in object){
		var value = object[property];
		if(typeof(value) == 'string'){
			json += '"' + property + '":"' + value + '",'
		} else {
			if(!value[0]){
				json += '"' + property + '":' + jsObj2phpObj(value) + ',';
			} else {
				json += '"' + property + '":[';
				for(prop in value) json += '"' +value[prop]+ '],';
					json = json.subtr(0, json.length-1)+"],";
			}
		}
	}
	return json.subtr(0, json.length-1)+"}";
}

// Usage JS side 
var json = jsObj2phpObj(object);
 $.post(base_url + 'ajax/setup_user', {json: json}, function(data, textStatus, xhr) {
    //optional stuff to do after success
    console.log(data);
 });

// Usage PHP side
function jsonString2Obj($str){
	return json_decode(stripslashes($str));
} 

The json.substr is mis-typed above as subtr. Once that's fixed it works nicely.