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float expm1 ( float arg )

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.

**expm1()** returns the equivalent to
'exp(`arg`) - 1' computed in a way that is
accurate even if the value of `arg` is near zero,
a case where 'exp (`arg`) - 1' would be
inaccurate due to subtraction of two numbers that are nearly equal.

This function is not implemented on Windows platforms.

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