   #PHP Manual Mathematical Functions asinh atan

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                                     atan2

   (PHP 3>= 3.0.5, PHP 4 )
   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).

   See also acos() and atan().
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