(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
float expm1 ( float $arg )
expm1() returns the equivalent to 'exp(arg) - 1' computed in a way that is accurate even if the value of arg is near zero, a case where 'exp (arg) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal.
Parameters:
arg
The argument to process
Returns:
'e' to the power of arg minus one
Changelog:
5.3.0
This function is now available on all platforms
See also:
log1p() -
exp() -
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