Madness

Question

can't get it.

$r = 2."2";
$r = 2.$r-$r;

That's code from one of php questions.
I can't get how it comes that answer is 200.

It's not correct code, is it???

Answer 1

$r = 2."2" = "22"
$r = 2.$r - $r = 2."22" - "22" = "222" - "22" = 200

Answer 2

cheers