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                                     log1p

   (PHP 4 >= 4.1.0)
   log1p --  Returns log(1 + number), computed in a way that 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.
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