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
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.
The argument to process
log(1 + num)
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