expm1()

expm1 - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero

Syntax

float expm1 (float $arg)

Arguments

• arg - The argument to process

Description

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.

Version

PHP 4.1.0, 5

Return value

'e' to the power of arg minus one