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# expm1

(PHP 4 >= 4.1.0)

expm1 -- Returns exp(number) - 1, computed in a way that accurate even when the value of number is close to zero

## Description

``float expm1` (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 in a future release of PHP without notice. Be warned and use this function at your own risk.

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

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