(PHP 4 >= 4.1.0, PHP 5)
acosh — Inverse hyperbolic cosine
$arg
    )
   Returns the inverse hyperbolic cosine of
   arg, i.e. the value whose
   hyperbolic cosine is arg.
  
argThe value to process
   The inverse hyperbolic cosine of arg
  
| Version | Description | 
|---|---|
| 5.3.0 | This function is now available on all platforms |