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(PHP 4 >= 4.1.0, 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, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function 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.

Related Function(s)

expm1()

log()