(PHP 4 >= 4.1.0, PHP 5)
log1p -- Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero| 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. |
| Warning |
This function is currently not documented; only the argument list is available. |
Note: This function is not implemented on Windows platforms.