log1p

    (PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

    log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero

    Description

    log1p(float $num): float

    log1p() returns log(1 + num) computed in a way that is accurate even when the value of num is close to zero. log() might only return log(1) in this case due to lack of precision.

    Parameters

    num

    The argument to process

    Return Values

    log(1 + num)

    See Also

    • expm1() - Returns exp($num) - 1, computed in a way that is accurate even when the value of number is close to zero
    • log() - Natural logarithm
    • log10() - Base-10 logarithm

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