atan2
atan2
(PHP 4, PHP 5, PHP 7)
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).