PHP 8.1.24 Released!


(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

asinhSeno Hiperbólico Inverso


asinh(float $arg): float

Retorna o inverso do seno hiperbólico de arg, isto é, o valor cujo seno hiperbólico é arg.

Nota: Esta função não foi implementada em plataformas Windows.



O argumento para processar

Valor Retornado

O seno hiperbólico inverso de arg

Veja Também

  • sinh() - Seno hiperbólico
  • asin() - Seno Inverso (arco seno)
  • acosh() - Cosseno Hiperbólico Inverso
  • atanh() - Tangente hiperbólica inversa

add a note

User Contributed Notes 2 notes

ape_cwb at yahoo dot com dot br
15 years ago
The correct implementation of asinh(x) for Windows plataform is:

function asinh($x)
return ln($x + sqrt(1 + pow($x, 2)));

function ln($x)
return $x = log($x)/log(M_E);

The worksheet above includes a comparation about the native asinh(x) and the implemented version using LN and LOG (like Snoyes posted on 27-Dec-2005 07:42)

This implementation using LN, give THE SAME results that function asinh(x) linux native.

Allan Patrick Engel
Curitiba - Paraná - Brasil
snoyes at gmail dot com
17 years ago
asinh for windows:

The definition for asinh is asinh(z) = log(z + sqrt(z^2 + 1))

The built-in math functions and operators give poor results for small values of z. The BCMath version produces closer results, but still quite distant if z < 1. A BCMath version of the log function might help.

if (!function_exists("asinh")) {
function asinh($z) {
return log($z + sqrt($z^2 +1));

if (!function_exists("bcasinh")) {
function bcasinh($z) {
return log(bcadd($z, bcsqrt(bcadd(bcpow($z, 2), 1))));
To Top