log1p()

log1p - Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero

Syntax

float log1p (float $number)

Arguments

• number - The argument to process

Description

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.

Version

PHP 4.1.0, 5

Return value

log(1 + number)