log1p
(PHP 4 >= 4.0.7, PHP 5)
log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
설명
float log1p
( float $number
)
Warning
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
log1p() returns log(1 + number ) computed in a way that is accurante even when the value of number is close to zero. log() might only return log(1) in this case due to lack of precision.
Note: 이 함수는 윈도우 플랫폼에서는 작동하지 않습니다.
매개변수
- number
-
The argument to process
반환값
log(1 + number )