HH\Lib\Math\is_nan
Returns whether a num is NAN
namespace HH\Lib\Math;
function is_nan(
num $num,
): bool;
NAN is "the not-a-number special float value"
When comparing NAN to any value (including NAN) using operators
false will be returned. NAN === NAN
is false.
One must always check for NAN using is_nan
and not $x === NAN
.
Parameters
num $num
Returns
bool