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PHP atan2

PHP original manual for atan2 [ show | php.net ]

atan2

(PHP 4, PHP 5, PHP 7)

atan2 — Arc tangent of two variables

Description

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).

Parameters

y

Dividend parameter

x

Divisor parameter

Return Values

The arc tangent of y/x in radians.

See Also