PHP has an "INF" (infinite) double constant Posted by nicmart on Tuesday September 10, 2013 @04:02AM from the php.net dept. http://php.net/manual/en/math.constants.php ( 2 comments | 2 points | on HN )
http://en.wikipedia.org/wiki/IEEE_floating_point
Quote: "The standard defines arithmetic formats: sets of binary and decimal floating-point data, which consist of finite numbers (including signed zeros and subnormal numbers), infinities, and special "not a number" values (NaNs)"