Re: [Phpgroupware-developers] what does this mean??

[Michael Dean]

!! is a simple trick to force the result to a boolean.  The results of
$rights & $required is not a boolean, but the result of a bitmask
operation.  AFAIR, this is more significant in PHP3 than PHP4.  Run this
script to see what I mean.  I refrained from testing with 1 and 1 since
the full effect wouldn't be revealed.

On Fri, 2002-10-11 at 18:14, Chris Weiss wrote:
> What is "!!"?  I only see reference to ! as NOT, and !! seems to be NOT(NOT) 
> or
> basically no change.

");
	}

	function test_expr($i, $j)
	{
		tr(
			"$i & $j",
			$i & $j,
			($i & $j) == true ? 'Y' : 'N',
			!!($i & $j),
			!!($i & $j) == true ? 'Y' : 'N'
		);
	}

	tr('_expression_', 'Result', 'Result == true', '!!Result', '!!Result == true');

	test_expr(8, 31);
	test_expr(8, 32);
?>

$c0

$c1

$c2

$c3

$c4