(PHP 4, PHP 5, PHP 7)
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).
y
Dividend parameter
x
Divisor parameter
The arc tangent of y
/x
in radians.
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https://www.php.net/manual/en/function.atan2.php