[PHP] convert degrees to heading

[René Fournier]

I have to write a little function to convert a direction from degrees 
to a compass -type heading. 0 = West. 90 = North. E.g.:

from:
135 degrees
to:
NW
Now, I was planning to write a series of if statements to evaluate e.g.,
if ($heading_degrees < 112.5 && $heading_degrees > 67.5) {
        $heading_compass = "N";
        }
The works, but it will require
N, NNW, NNE, NE, NW, ENE, NWW... many IF statements.
Can anyone think of a programatically more elegant and efficient way of 
converting this type of data? (I suppose this is not really a problem, 
just a curiosity.)

...Rene
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