(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
$num): float
log1p() returns log(1 +
num) computed in a way that is accurate even
when the value of num is close to zero.
log() might only return log(1) in this case
due to lack of precision.
numThe argument to process
log(1 + num)