(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
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.
This function is currently not documented; only the argument list is available.
Note: This function is not implemented on Windows platforms.
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