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PHP : Function Reference : Mathematical Functions : expm1

expm1

Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero (PHP 4 >= 4.0.7, PHP 5)
float expm1 ( float arg )


Code Examples / Notes » expm1

hagen

Compare this to log1p (which is its inverse).
Also, You may have to use a similar workaraound in case the underlying C library
does not support expm1:
function expm1($x) {
    return ($x>-1.0e-6 && $x<1.0e-6) ? ($x + $x*$x/2) : (exp($x)-1);
}


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