Pass parser class variables to php function.

[eluser]adaxa[/eluser]
Hi everyone,
I have problem with parser class. What I have is a form with dropdown-list which I try to repopulate with last selected city on submit. For example I have this:

Code:

{cities_list}
  <option value="{city_id}" &lt;?php echo set_select('city', "{city_id}"); ?&gt;>{city_n}
{/cities_list}

But this doesn`t work