Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
expm1 ( float $arg ) : float
The argument to process
'e' to the power of arg minus one
Note: 'e' is the base of the natural system of logarithms, or approximately 2.718282.
<? $arg = 0.01234; $return = expm1($arg); echo $return; ?>