I have a string like this
u041au043bu0443u0431 Test;

It was decoded by json_encode(), the original string was Клуб Test in russian.
when I put it to js like

alert(u041au043bu0443u0431 Test);

I get correct displaying, like on the screen. So js
in some way poperly decodes it to normal view.
The question is how can I do the same thing in php, is there any built in method?

THE ANSWER IS:

$json_in = '{testKey:u041au043bu0443u0431 Test}';

$json_out = json_decode($json_in, true);

or

Convert  u041au043bu0443u0431 to  Клуб 

and perform html_entity_decode($str, null, 'UTF-8');