useful recursive PHP functions

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PHP Manual for

log1p

(PHP 4 >= 4.1.0)

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.

Warning

This function is currently not documented; only the argument list is available.

Note: This function is not implemented on Windows platforms.