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log1p

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

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

float log1p ( float $number )

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

Parameters:

number

The argument to process

Returns:

log(1 + number)

Changelog:

5.3.0

This function is now available on all platforms

See also:

Links:

http://php.net/manual/en/function.log1p.php

doc_php

2016-02-24 16:02:30

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