tan()
tan() — Tangent.
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
tan() returns the tangent of the num parameter. The num parameter is in radians.
Signature
tan(float $num): float
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $num | float | The argument to process in radians |
Return value
The tangent of num
Example
A runnable snippet:
echo tan(M_PI_4); // 1
See also
atan(), atan2(), sin(), cos(), tanh(), deg2rad()
All PHP 8.5 built-in functions
Reference card built from the PHP manual page tan() (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.