In mathematics, the inverse hyperbolic functions are the inverse functions of the hyperbolic functions. For a given value of a hyperbolic function, the corresponding inverse hyperbolic function provides the corresponding hyperbolic angle. PHP provides us with builtin functions for inverse hyperblic calculations. The *asinh()* function in PHP is used to find the inverse hyperbolic sine of a number passed to it as argument.

**Syntax:**

floatasinh($value)

**Parameters:** This function accepts a single parameter $value. It is the number whose inverse hyperbolic sine value you want to find. The value of this parameter must be in radians.

**Return Value:** It returns a floating point number which is the inverse hyperbolic sine value of a number passed to it as argument.

Examples:

Input : asinh(7) Output : 2.6441207610586 Input : asinh(56) Output : 4.7185785811518 Input : asinh(2.45) Output : 1.6284998192842

Below programs, taking different values of $value are used to illustrate the asinh() function in PHP:

- Passing 7 as a parameter:
`<?php`

`echo`

`(asinh(7));`

`?>`

Output:

2.6441207610586

- Passing 56 as a parameter:
`<?php`

`echo`

`(asinh(56));`

`?>`

Output:

4.7185785811518

- Passing 2.45 as a parameter:
`<?php`

`echo`

`(asinh(2.45));`

`?>`

Output:

1.6284998192842

**Reference**:

http://php.net/manual/en/function.asinh.php

## leave a comment

## 0 Comments