(PHP 4 >= 4.0.7, PHP 5)
Returns log(1 + number), computed in a way that is accurate even when
the value of number is close to zero
( float $number
This function is
EXPERIMENTAL. The behaviour of this function, its name, and
surrounding documentation may change without notice in a future release of PHP.
This function should be used at your own risk.
log1p() returns log(1 +
) computed in a way that is accurante even
when the value of number
is close to zero.
log() might only return log(1) in this case
due to lack of precision.
The argument to process
log(1 + number
This function is now available on all platforms