atan2 in PHP

Syntax of atan2 float atan2(float y, float x) Using the signs of both parameters to determine the quadrant the value is in, returns the arc tangent of x and y in radians. Example of atan2 0.78539816339745-2.35619449019230.785398163397450.46364760900081-2.3561944901923-0.78539816339745