Syntax of acosh in PHP
float acosh(float value)
Returns the inverse hyberbolic cosine of value.
Example of acosh function in php
<?php
echo(acosh(7) . "<br>");
echo(acosh(56) . "<br>");
echo(acosh(2.45));
?>
Output of acosh function in PHP
2.6339157938496
4.7184191423729
1.5447131178707