Encode an object as a string

serialize.js

function serialize(obj, _name) {
        var i, pfx, tp, str = [];
        if(!obj)
                return _name;
        tp = typeof obj;
        if(obj.length && tp != 'object' && tp != 'string') { /* pure arrays */
                for(i = 0; i < obj.length; ++i) {
                        pfx = (_name ? _name+'['+i+']' : i);
                        str.push(pfx+'='+obj[i]);
                }
        }
        else { /* objects */
                for(i in obj) {
                        pfx = (_name ? _name+'['+i+']' : i);
                        if(typeof obj[i] == 'string' || typeof obj[i] == 'number') {
                                if(obj[i].replace)
                                        str.push(pfx+'='+obj[i].replace(/&/g, '%26'));
                                else
                                        str.push(pfx+'='+obj[i]);
                        }
                        else
                                str.push(serialize(obj[i], (_name ? _name+'['+i+']' : i)));
                }
        }
        return str.join('&');
}