acosh()
acosh() — Inverse hyperbolic cosine.
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 cosine of num, i.e. the value whose hyperbolic cosine is num.
Signature
acosh(float $num): float
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $num | float | The value to process |
Return value
The inverse hyperbolic cosine of num
Example
The PHP manual ships no example for acosh(); the signature and the parameter table above are the contract.
See also
cosh(), acos(), asinh(), atanh()
All PHP 8.5 built-in functions
Reference card built from the PHP manual page acosh() (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.