Math 함수 목록
PHP Manual

expm1

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

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

설명

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.

인수

arg

The argument to process

반환값

'e' to the power of arg minus one

변경점

버전 설명
5.3.0 This function is now available on all platforms

참고


Math 함수 목록
PHP Manual