log1p
(PHP 4 >= 4.1.0, PHP 5)
log1p --
Returns log(1 + number), computed in a way that is accurate even when
the value of number is close to zero
Description
float
log1p ( float number )
警告 |
這個函數是實驗性質的。這個函數的行為、名稱、和關於此函數的任何其他文件在未來PHP的發行中可能會在不通知的情況下改變。 使用此延伸需自行承擔風險。 |
log1p() returns log(1 +
number) computed in a way that is accurante even
when the value of number is close to zero.
See also expm1() and
log().