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PHP cos() Function

Complete PHP Math Reference

Definition and Usage

The cos() function returns the cosine of a number.

Syntax

cos(x)

Parameter	Description
x	Required. A number

Tips and Notes

Note: The cos() function returns a numeric value between -1 and 1, which represents the cosine of the angle.

Example

In the following example we will return the cosine of different numbers:

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

The output of the code above will be:

-0.9899924966004454
-0.9899924966004454
1
-1
1