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sqrt	tanh

Math Functions	Last updated: Mon, 26 Oct 2026

tan

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

tan — Tangent

Description

function tan(float $num): float

tan() returns the tangent of the num parameter. The num parameter is in radians.

Parameters

num: The argument to process in radians

Return Values

The tangent of num

Examples

Example #1 tan() example

<?php

echo tan(M_PI_4); // 1

?>

See Also

atan() - Arc tangent
atan2() - Arc tangent of two variables
sin() - Sine
cos() - Cosine
tanh() - Hyperbolic tangent
deg2rad() - Converts the number in degrees to the radian equivalent

sqrt	tanh

Math Functions	Last updated: Mon, 26 Oct 2026