Math Functions
[*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:
<?php
function sgn($liczba)
{
if($liczba>0)
$liczba=1;
else if($liczba<0)
$liczba=-1;
else if(!is_numeric($liczba))
$liczba=null;
else
$liczba=0;
return $liczba;
}
?>
The difference is that it returns null when the argument isn't a number at all.
abs
(PHP 4, PHP 5)
abs — مقدار قدر مطلق
Parameters
- number
-
مقدار عددی برای پردازش
Return Values
قدر مطلق number. اگر آرگومان number از نوع float باشد نوع بازگشتی نیز float است در غیراین صورت integer (همانند float معمولا بازه مقدار بیشتری نسبت به integer دارد).
Examples
Example #1 مثال abs()
<?php
$abs = abs(-4.2); // $abs = 4.2; (double/float)
$abs2 = abs(5); // $abs2 = 5; (integer)
$abs3 = abs(-5); // $abs3 = 5; (integer)
?>
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User Contributed Notes
abs - [2 notes]
Ister ¶
4 years ago
svein dot tjonndal at gmail dot com ¶
1 year ago
If you don't have/want GMP and are working with large numbers/currencies:
<?php
function mb_abs($number)
{
return str_replace('-','',$number);
}
?>
No need to worry about encoding, as your numbers should all be basic (ANSI) strings.