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).
declaration of atan2
float atan2 ( float $y , float $x )
test atan2 online
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