atanh
(PHP 4 >= 4.0.7, PHP 5)
atanh — Inverse hyperbolic tangent
說明
float atanh
( float $arg
)
Returns the inverse hyperbolic tangent of arg , i.e. the value whose hyperbolic tangent is arg .
Note: 本函式未在 Windows 平台下實作。
參數
- arg
-
The argument to process
Return值
Inverse hyperbolic tangent of arg