(PHP 4 >= 4.1.0)expm1 -- Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
Descriptionfloat expm1 ( float number)
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.
This function is currently not documented; only the argument list is available.