Returns the inverse hyperbolic cosine of distinct numbers:
<?phpecho(acosh(7) . "<br>");echo(acosh(56) . "<br>");echo(acosh(2.45));?>The acosh() function returns the inverse hyperbolic cosine of a number.
acosh( number );
| parameter | describe |
|---|---|
| number | Required. Specify a number. |
| Return value: | The inverse hyperbolic cosine of number . |
|---|---|
| Return type: | Float |
| PHP version: | 4.1+ |
| PHP change log: | PHP 5.3: The acosh() function is available on all platforms. |