Math
PHP Manual

atan2

(PHP 4, PHP 5)

atan2 — Arc tangent of two variables

Описание

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).

Список параметров

y

Dividend parameter

x

Divisor parameter

Возвращаемые значения

The arc tangent of y /x in radians.

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Math
PHP Manual