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round	sinh

Math Functions	Last updated: Mon, 26 Oct 2026

sin

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

sin — Sine

Description

function sin(float $num): float

sin() returns the sine of the num parameter. The num parameter is in radians.

Parameters

num: A value in radians

Return Values

The sine of num

Examples

Example #1 sin() example

<?php
// Precision depends on your precision directive
echo sin(deg2rad(60)), PHP_EOL;  //  0.866025403 ...
echo sin(60), PHP_EOL;           // -0.304810621 ...
?>

See Also

asin() - Arc sine
sinh() - Hyperbolic sine
cos() - Cosine
tan() - Tangent
deg2rad() - Converts the number in degrees to the radian equivalent

round	sinh

Math Functions	Last updated: Mon, 26 Oct 2026