PHP is that possible to add if statements when calling objects obj->sub1({if(foo==true) return foo; else return bar})

Im trying to create if statement inside $soap object, while typing its params. my need is like that: $soap->add($name,$something,$foo,$optionalarg,$optionalarg2);

this itself isnt too bad, but I need to change "optionalarg" for something else (to be precise "brak" ("none" in polish) ) making lots of cases dosent seem like good idea in that situation (it would be ton of that, and its not proper way to do that, I guess)

I know I could in theory prepare if for each optional arg before $soap, but Im looking for alternatives.

I tried googling, I tried doing random-ish things (sometimes stuff just works but not in this case), like

$soap->add($name,$something,$foo,{if($enabled==true) $optarg else "brak"})

$soap->add($name,$something,$foo,{if($enabled==true) return $optarg else return "brak"})

$soap->add($name,$something,$foo,if($enabled==true) $optarg else "brak")

everything was throwing errors, so I gave up.