PHP cosh() Function: Usage and Examples

Calculates the hyperbolic cosine of a number.

What Is cosh() in PHP?

Calculates the hyperbolic cosine of a number.

Its syntax is:

cosh(float $num): float

Parameters:

• $num — Accepted as float; required argument.

Return type: float. Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().

Availability: Core PHP.

Example 1: Basic Usage

<?php

echo cosh(0);

Output:

1

Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().

Example 2: A Different Input

<?php

echo round(cosh(1), 3);

Output:

1.543

Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().

Practical Example: Applying It in a Program

<?php

$inputs = [-1, 0, 1]; foreach ($inputs as $input) { echo round(cosh($input), 4) . PHP_EOL; }

Output:

1.5431
1
1.5431

Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().

Important Behavior and Edge Cases

• Key behavior: Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().
• Environment: Core PHP.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Calculates the hyperbolic cosine of a number.
• Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().
• Core PHP.

Summary: Input values are in the real-number domain; large values may overflow to INF. Do not confuse cosh() with cos().