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log1p(PHP 4 >= 4.0.7, PHP 5) log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero Description float log1p ( float $number ) 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. log1p() returns log(1 + number ) computed in a way that is accurante 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
Return Valueslog(1 + number ) ChangeLog
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