(PHP 4 >= 4.0.7, PHP 5)
expm1 — Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
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.
The argument to process
'e' to the power of arg minus one
| Version | Description |
|---|---|
| 5.3.0 | This function is now available on all platforms |