I was thinking is there any easy solution to convert euro prices to dollars with PHP. Something similar to date and time function maybe.
edit. I have euro prices on the site but I'd like to have dollar prices along them too. So I need solution to auto calc dollars in real time.
You will need to use a 3-rd party api to do this conversion for you. Please take a look at this one, for example: http://fixer.io/ . Not to reinvent the wheel, I recommend you using a ready-made wrapper for actually making the requests. I've found this one which looks pretty thin and solid: https://github.com/fadion/Fixerio
Then, all you have to do is something like that:
$exchange = new Exchange();
$exchange->base(Currency::USD);
$exchange->symbols(Currency::EUR, Currency::GBP);
$rates = $exchange->get();