(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
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
Returns:
log(1 + number)
Changelog:
5.3.0
This function is now available on all platforms
See also:
expm1() -
log() -
log10() -
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