atan2
PHP 4, PHP 5, PHP 7, PHP 8
atan2 - Arc tangent of two variables
atan2(
float$y,
float$x ): float
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.