cos()
cos() — Cosine.
Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.
What it does
cos() returns the cosine of the num parameter. The num parameter is in radians.
Signature
cos(float $num): float
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $num | float | An angle in radians |
Return value
The cosine of num
Example
A runnable snippet:
echo cos(M_PI); // -1
See also
acos(), sin(), tan(), deg2rad()
All PHP 8.5 built-in functions
Reference card built from the PHP manual page cos() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.