variable attribute names in objects

[Naug]

I try to dynamically set name of an attribute in an object to be changed.

when working with simple variables this

$a='b';

$$a=2;

set $b value to 2

but when working with object

$a='object->variable';

$$a=2;

doesnt change value of $object->variable

Any clues what I am doing wrong?

[Naug]

whadda you know this forum helps thinking.
$a="variable_name";
$object->$a=2;

Is da way to do it. Took me at least an hour to formulate question and 5 minutes to answer it myself