atan2
PHP function
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(PHP 4, PHP 5, PHP 7, PHP 8)
Arc tangent of two variables
Description
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).
Parameters
yDividend parameter
xDivisor parameter
Return Values
The arc tangent of y/x in radians.