";
}
echo print_pi("brotato");
$number = 11;
calc_square($number);
echo "a square of 11 is " . $number . ".
";
$number2 = NULL; /* nice to know how to modiy a variable */
num_raised($number2, 2, 4);
echo "a cube of 2 is " . $number2 . ".
";
var_dump($number2);
?>
PHP defined variables including mine.