===== Syntax =====

<code php>
float asinh(float $val)
</code>

//(PHP 4 >= 4.07, PHP 5)//

^ $val | Value to compute the inverse hyperbolic sine for. |
^ RETURNS | Computes the trigonometry function ''inverse hyperbolic sine'' for the degree in radians (**$val**). |

===== What it Does =====

This function computes the inverse hyperbolic sine for the argument **$val** which is the degree in radians.

**Note: This function is not currently available for PHP on Windows.**

===== Example =====

<code php>
// compute the inverse hyperbolic sine for 1.4 radians
echo 'asinh(1.4) = ' . asinh(1.4);
</code>