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