To find the hyperbolic arccosine of a number, we can use the php **acosh()** function.

`acosh(x)`

In php, we can easily use trigonometric functions from the collection of php math functions. These php math functions allow us to perform trigonometry easily and in addition to the standard trigonometry, we have access to the hyperbolic trigonometry functions.

To find the hyperbolic arccosine of a number, we can use the php **acosh()** function.

Below is the php syntax to find the hyperbolic arccosine of a number.

`acosh(x)`

The input to the **acosh()** function must be a float greater than or equal to 1. The return value will be a float.

```
echo acosh(5.23); // 2.3382907483329896
echo acosh(0); // 0.6223625037147786
echo acosh(-5.32); // 5.298292365610484
```

## Finding the Inverse Hyperbolic Cosine of a Number in php

With php, we can also find the inverses of the common trigonometric functions. The **acosh()** function allows us to find the inverse of the hyperbolic cosine of a number.

Below, we show that if we pass a number to **cosh()** and then call the php **acosh()** function, we get back the same number.

`echo acosh(cosh(100)) // 100.0`

Hopefully, this article has been beneficial for you to understand how to use the math **acosh()** function in php to find the hyperbolic cosine of a number.

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