PHP cosh() Function – Hyperbolic Cosine

The cosh() function is a built‑in PHP function that returns the hyperbolic cosine of a numeric argument.

Syntax: float cosh(float $arg) Description: It computes the value defined as (exp(arg) + exp(-arg)) / 2.

Parameter: $arg – the float value whose hyperbolic cosine is to be calculated.

Return value: The hyperbolic cosine of $arg as a float.

Example usage:

<?php
echo cosh(3)."<br>";
echo cosh(-3)."<br>";
echo cosh(0)."<br>";
echo cosh(M_PI)."<br>";
echo cosh(2*M_PI);
?>

Sample output:

10.067661995778
10.067661995778
1
11.591953275522
267.74676148375