Use only function parameter if variable has a value

I'm developing a small system to add records which be can opened later. On the page view.php it shows all records of all different country. I just extend this to only show one selected countries.

I call this function with the following argument: $toxRecords->getStatsCountry();

If I want to show only one country, I just simple add the county code as parameter. Example: $toxRecords->getStatsCountry('NL');

Because I use one page to show all countries but also one specific country it needs to check if there is an variable. I check my POST with the following argument: toxInput::get('country'); This just simple return: $_POST['country'].

Now I just want that it will only use the function parameter if value country exists. This can be very simple, see below:

            if($country = toxInput::get('country')){
                $toxList    = $toxRecords->getRecords($country);
            }else{
                $toxList    = $toxRecords->getRecords();
            } `

But I was wondering if it possible to shorten this to one single lane? Example what I tried and will explain what I want:

$toxRecords->getRecords(if($country = toxInput::get('country')){ echo $country; });