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atan2(PHP 4, PHP 5) 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). Parameters
Return ValuesThe arc tangent of y /x in radians. |