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).
The arc tangent of y/x in radians.
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