php default arguments

Question

In PHP, if I have a function written like this

function example($argument1, $argument2=\"\", $argument3=\"\")

And I can call this function

Answer 1

It depends on spesification of function.

function a($b=true,$c=false){
 echo $b?'true':'false';
 }

executing

 a(NULL, 1);

results : false. but simply a() results : true

That means you want default argument, then you should use as default:

 a(true, 1);