PHP atan2() Function

The atan2() function returns the arc tangent of two variables x and y.

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).

Example -

ParameterDescription
yDividend parameter.
xDivisor parameter.

The arc tangent of y/x in radians.