If you don't have/want GMP and are working with large numbers/currencies:
No need to worry about encoding, as your numbers should all be basic (ANSI) strings.
(PHP 4, PHP 5)
abs — 절대값
처리할 수치 값
Example #1 abs() 예제
$abs = abs(-4.2); // $abs = 4.2; (double/float)
$abs2 = abs(5); // $abs2 = 5; (integer)
$abs3 = abs(-5); // $abs3 = 5; (integer)
add a note User Contributed Notes abs - [2 notes]
svein dot tjonndal at gmail dot com ¶
2 years ago
4 years ago
[*EDIT* by danbrown AT php DOT net: Merged user's corrected code with previous post content.]
jeremys indicated one thing - there is no sgn function wich actually seems a bit strange for me. Of course it is as simple as possible, but it is usefull and it is a standard math function needed occasionally.
Well, I have solved this function in a bit different matter:
The difference is that it returns null when the argument isn't a number at all.