Math Functions
PHP Manual

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 )

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
  • log
  • log10