**Warning: **This function is
*EXPERIMENTAL*. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.

**log1p()** returns log(1 +
`number`) 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.

**Note: **This function is not
implemented on Windows platforms.

## Parameters

`number`
The argument to process

## Return Values

log(1 + `number`)