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expm1(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 Description float expm1 ( float $arg ) Warning 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. Parameters
Return Values'e' to the power of arg minus one ChangeLog
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