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clamp	cosh

Math Functions	Last updated: Mon, 26 Oct 2026

cos

(PHP 4, PHP 5, PHP 7, PHP 8)

cos — Cosine

Description

function cos(float $num): float

cos() returns the cosine of the num parameter. The num parameter is in radians.

Parameters

num: An angle in radians

Return Values

The cosine of num

Examples

Example #1 cos() example

<?php

echo cos(M_PI); // -1

?>

See Also

acos() - Arc cosine
sin() - Sine
tan() - Tangent
deg2rad() - Converts the number in degrees to the radian equivalent

clamp	cosh

Math Functions	Last updated: Mon, 26 Oct 2026