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PHP Manual :: atan2

asinh || atan || Math Functions || PHP Manual

(PHP 4, PHP 5, PHP 7)

atan2Arc tangent of two variables


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).



Dividend parameter


Divisor parameter

Return Values

The arc tangent of y/x in radians.

See Also

asinh || atan || Math Functions || PHP Manual
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