PHP Manual
Math Functions
Inverse hyperbolic sine

asinh

(PHP 4 >= 4.1.0, PHP 5)

asinh — Inverse hyperbolic sine

Description

float asinh ( float $arg )

Returns the inverse hyperbolic sine of arg, i.e. the value whose hyperbolic sine is arg.

Parameters

arg: The argument to process

Return Values

The inverse hyperbolic sine of arg

Changelog

Version	Description
5.3.0	This function is now available on all platforms

See Also

sinh() - Hyperbolic sine
asin() - Arc sine
acosh() - Inverse hyperbolic cosine
atanh() - Inverse hyperbolic tangent