atan2
(PHP 4, PHP 5)
atan2 — Arc tangent of two variables
Description
float atan2
( float $y
, float $x
)
This function calculates the arc tangent of the two variables x and y . It is similar to calculating the arc tangent of y / x , except that the signs of both arguments are used to determine the quadrant of the result.
The function returns the result in radians, which is between -PI and PI (inclusive).
Parameters
- y
-
Dividend parameter
- x
-
Divisor parameter
Return Values
The arc tangent of y /x in radians.