[thelist] PHP is_nan

[Jay Blanchard]

[snip]
This is probably a real newbie error, but PHP's is_nan function is not
playing for me.  I've got this as a test:

<?
$tester = "hello";

if (is_nan($tester))

	{
	echo "this works";
	exit;
	}

else

	{
	echo "don't work";
	exit;
	}
?>
[/snip]

is_nan expects a floating point number. What version of PHP?