atan
base_convert
Math Functions
PHP Manual

# atanh

(PHP 4 >= 4.0.7, PHP 5)

atanh — Inverse hyperbolic tangent

### Description

float atanh ( float `$arg` )

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

### Parameters

`arg`

  The argument to process

### Return Values

Inverse hyperbolic tangent of `arg`

### Changelog

Version | Description
--- | ---
5.3.0 | This function is now available on all platforms

### See Also

- tanh()
- atan()
- asinh()
- acosh()

atan
base_convert
Math Functions
PHP Manual