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Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero


log1p

(PHP 4 >= 4.1.0, PHP 5)

log1pReturns 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 )

log1p() returns log(1 + number) computed in a way that is accurate even when the value of number is close to zero. log() might only return log(1) in this case due to lack of precision.

Parameters

number

The argument to process

Return Values

log(1 + number)

Changelog

Version Description
5.3.0 This function is now available on all platforms

See Also

  • expm1() - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
  • log() - Natural logarithm
  • log10() - Base-10 logarithm

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