What is the output of the following code?

What is the output of the following code?

function ratio ($xl = 10, $x2)

{

}

if (isset ($x2)) {

return $x2 / $xl;

echo ratio (0);
A . 0
B . An integer overflow error
C . A warning, because $xl is not set
D . A warning, because $x2 is not set
E . A floating-point overflow error
F . Nothing

View Answer

Answer: D