Description
$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).
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-function.atan2.html
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References
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