JavaScript Editor Javascript debugger     Website design 

log1p

Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero (PHP 4 >= 4.0.7, PHP 5)
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. log() might only return log(1) in this case due to lack of precision.

Note:

This function is not implemented on Windows platforms.

Parameters

number

The argument to process

Return Values

log(1 + number)