atanh()
atanh() — Inverse hyperbolic tangent.
Built-in function of PHP 8.5. The manual lists it as available in PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.
What it does
Returns the inverse hyperbolic tangent of num, i.e. the value whose hyperbolic tangent is num.
Signature
atanh(float $num): float
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $num | float | The argument to process |
Return value
Inverse hyperbolic tangent of num
Example
The PHP manual ships no example for atanh(); the signature and the parameter table above are the contract.
See also
tanh(), atan(), asinh(), acosh()
All PHP 8.5 built-in functions
Reference card built from the PHP manual page atanh() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.